I'm building a budget spreadsheet, currently up to about 75 items. Life happens and I have a motorcycle build in progress, so how much I put into the car at once depends on several variables. I am planning to do as you suggest and focus on the restoration, which will include structural reinforcement and repair, suspension upgrades and body panel repair/replacement. After those items, a wiring solution along with potential computer upgrades are most important. Small interior modifications and repairs are next, followed by a fuel system and exhaust. A brake upgrade is a tough decision, because I don't want to do it twice, so that may mean selling my 31 spline axles for a 5-lug version and then require new wheels/tires. The minimum engine upgrades are a few small items that I think should be replaced based on cost effectiveness, age or current undesirable design. If finances permit, I will separate the engine and transmission, replace the clutch, resurface the flywheel and modify the engine in the way I deem most cost effective. I will place my list of ideas in order of priority and:
I'm requesting ideas or sources for parts.
Restoration
-Custom sub-frame connectors, overall frame reinforcement, media blast, DS floor pan replacement, DS apron repair, Paint.
Body panels
-Looking for an OEM style fiberglass hood/hatch (bolt-on) or for advice on functionality/usefulness of a scooped hood like a 1.5" Mach 1. Also looking for good Trim and GT Body Kit panels.
Suspension
-Tubular K-Member, U/L control arms, sway bars, strut tower brace that fits around Edelbrock Performer RPM (Typhoon) intake, Strut/shock or coilover options (lighter than stock front end causes it to ride high currently) adjsutable?
Wiring-
Looking at a few options, what's the current status of TwEECer user satisfaction and power increase? Was a painless kit worthwhile for those that have it? Door/window motor sources?
Interior
-Parts seem to be getting expensive, what dyes or paints have people used with good result? Any comfortable, light seats that are fairly cheap and can be reclined/on tracks?
Fuel System
-Anyone with experience refurbishing your tank, any links on required fuel flow, fuel pump and lines (lines are of restoration importance) adjustable FPR advice?
Exhaust
-Header options (1-3/4" to 3") for maximum ground clearance w/ longtubes and post crossmember x-pipe.
Has anyone done after-axle mufflers? Would this increase or decrease performance? Trying to think outside the box here, shouldn't cost much. Looking at the area, there should be enough room if placed vertically. I am always concerned about the space between the Subframe connectors and DS as well as a ground clearance increase (for things like speed bumps).
Brakes
-5-lug would mean new wheels, so I could go 17" and get 13" brakes and rear disk, but that would mean replacing current 31 spline axles. Worthwhile? Or save about $1500 and do Interceptor Crown Vic disk brakes on current 4-lug equipment?
Engine
-In order of priority: Oil pan with low oil sensor (possibly one designed for cooling)/ Dual sump oil pump (explorer one from crate motor is single), Coil (never changed), Adjustable Fuel Pressure Regulator, Underdrive pullies, Phenolic Spacer? If budget allows: higher compression 347 stroker on a new block with current heads worked with aftermarket roller rockers. I would expect 40-50 hp from displacement, 10-15 hp from compression 15-20 hp from tune and pullies, 10-15? from the head work and exhaust, so an average estimate at about 80HP extra. This would certainly add low end torque (displacement alone) for the launch, bringing a car that is capable of 12s now (13.1 before a few mods, before I fixed wheel hop and had crappy tires) into either the 11s or at least a steady 12.0##. Moving weight to the rear, removing some weight, and suspension upgrades (LCA) should help too. (Reminder: This is the last priority of the budget and not where I'm looking for the most advice)
Air Conditioning, Aftermarket/OEM style?