The best rain tire ive used is the Toyo T1-S. I have a 308rwhp mach with 4:10 and i am more confedent with the T1-S tire when its raining then the stock tires when its dry.
Id get a ford racing crate motor. Ive seen to many horror storys with crate engine builders. Ive never heard of a prob with a ford crate motor. They might not make as much HP for the price but i could live with 20 less hp for a motor that will last 100k + miles...
Mine has a 157 tooth also, but you can always have the flywheel re ringed to a diff tooth count. I had one re ringed at a local machine shop for my 5.0 when my starter chewed the teeth off.
There are adapters made specifically for late model 17x8 wheels like the bullits. Ive seen them in a few mags but cant remember exactly who sells them. It might have been mustangs plus
Dont get it painted. My chin spoiler hits everything, and would look like crap if i painted it. Without piant on it you can barely see the scratches. Alot of my other friends with machs are already on there second and third chin spoiler.
I have the SLP offroad X on my mach and it sounds mean as hell with magnaflows. But with racebullets it might be to loud. My buddy has a magnaflow offroad X with racebullets and it is so loud it hurts. I would look into getting a catted X pipe or a prochamber.