Ford guy? go with the fox bodys. 87 to 93...tons of components.
Here's the thing...most guys dump a crapload into their car say like 25 to 30K engine, tranny, rear, suspension, lightening, etc.. They will never get out of it what they put in. So my opinion is look for a complete roller with all the goodies, and put in a BB or stroker and a PA Supercomp. You can probably get a good roller for 5K, the engine 7-10K, and tranny 2.5K. You got a 10-11 sec car for under 15K. Another way is to look for one of these guys who got bored with their Foxbody. They are a dime a dozen, so they they dumped in all the cash and now can't get out from underneath it and will usually let it go for 15K or less.
7K your only gonna have say a 12 or 13 sec car.
JMO