if i had a FORD, first i would replace the chassis with one from a chev/GM
Then i would replace the body with a fiberglass shell (custom made).
Then i would replace the engine with a 350 Chevy small block, with dual carbuerators and a supercharger, with a scoop on top.
I would take out the stereo and speakers, then replace it with a 300 WATT stereo system.
I would put in 4-point safety harnesses.
i cant think of very much else to replace.