85 vic performance

I recently bought a 1985 crown victoria with the 302 and TBI and I was wondering where do I get performance parts for my car like headers, Intakes, and cams? Im really trying to find a pair of headers,( preferably long tubes) so I have complete aftermarket exhaust. What little things can you do? Im pretty competent when it comes to working on cars so go ahead and give it to me straight. Please. Gracias.

I also want to lower the car a bit and put on some mustang bullitt wheels if possible. Spring kits? Wheel fitment issues? perf. shocks? Any help would be greatly appreciated.