I read a few of your posts and it sounds like you spent a fair amount of money. Why would you want to use 25 year old wires to run the engine?
Most fox wiring issues are either self inflicted or done by a previous owner. Other than the headlight switch, there aren't many major wiring issues with these cars.
If you are worried the real ford wiring diagram book is $15 at helm inc. If you can read it, you can trace what you need.
You speak like you are willing to put your life savings in this car, that's your business, but IMO, that is crazy.
Do what's best a little at a time.
To necessitate a fuel system you need to cross 500rwhp, if you cross 500rwhp you split the block, you split the block you need a dart (and a crapload more of parts because they all get ruined).
Best case scenario, you need about $6000 on just the shortblock, worst case, with new heads cams etc, $12,000+.
You obviously don't have the brakes, which oddly enough should be way ahead of a fuel system.
So why not spend the money there instead of throwing it into something you really don't need, and no offense, probably are never going to need.
There's like a half dozen active members with street cars on this forum with dart blocks.
None of that money includes a trans, a rear, a
suspension that puts up with that much power etc.
If the car is low on gas, it will take like 30 minutes and $100 to switch to a gss340, or you could take the next 3 months and 2 grand, change the wiring and install a fuel system you don't currently need and hope it works right.
Easy choice IMO, since they both give exactly the same results.
Take the $2000, setup 94/95 spindles, cobra pbr's, rear discs and get some new wheels.
And set the car up so no matter what happens, you do NOT split that block, because it may be years before you drive it again.
I actually believe brakes and
suspension should be done on a fox before you start adding power.
They add safety and value.
Just my opinions, you can take or leave it.
While harsh, I do have your best interest in mind.