What would the cost be to build a good foxbody 1/4 mile car...the goal would be mid-low 12 street car.
Depends on what you start with
LX Coupe is the best platform but they are expensive. But with a couple of bolt-ons and some nitrous you can get mid/low 12s (with the right tire). If you got an okay condition GT you could probably get mid 12s for $6000, car included.
I'm not entirely sure. You can always find a deal if you don't care about the general condition. My old notchback I bought for $4000, it already had Heads/Cam/Intake, suspension stuff, aluminum driveshaft, upgraded clutch, etc. Made 313 rwhp as it sat. With slicks you could definitely bang mid 12s. IMO