AdamB

intake, headers, supercharger, tuning software for the computer for accurate tunes or try running higher octane and advancing the timing via distributor...

I would start with the simple bolt ons that will help your other mods come alive. Intake and Headers first, then larger MAF and TB etc.

r.barn

some better cylinder heads or a supercharger will give you best bang for the buck.
for a really good deal check out the Thumper ported heads., good for the budget minded.

here's some links to check out.

http://store.summitracing.com/egnsea...5&autoview=sku

http://www.thumperoforangepark.com/

http://www.kennebell.net/supercharge.../mustang50.htm

http://www.vortechsuperchargers.com/products/systems/

http://www.latemodelrestoration.com

PRO50SC

Ahhhh, another white one. Beautiful car and welcome. How much are you looking to spend on mods? That will help decide what to recommend.

Materias

really nice car!! welcome!