However, before getting into any of these articles, it is highly recommended you first read our list of Top 10 Foxbody Modifications to get a clear idea of what to upgrade not only on the engine, but the suspension, the chassis and brakes.
After that, you can decide which way you'd like to go. An ecomonical performance build can simply be upgrading the stock E7TE cylinder heads by porting them yourself. Or, as previously mentioned, GT40/GT40P heads. If you have some more coin to spend, look further into aftermarket cylinder heads, an aftermarket intake and an aftermarket camshaft. A proper combination of these 3 performance parts will easily lay 300rwhp+ to the ground from a 5.0 equipped Fox. If you want to go bigger, consider stroking your 302 to a 331 or 347. Either of these larger displacement engines topped with a performance top end (heads, cam, intake) can lay down a hefty 350-400rwhp.
Porting E7TE Cylinder Heads - Are they worth porting?
Ford GT40 vs GT40P FAQ - What is the difference?
Foxbody 5.0 Engine Build FAQ - How to make 300HP, 400HP, 500HP
GT40 vs Cobra vs Explorer Intake FAQ