GT-40 heads, what years stock?
 

What cars and what years came stock with gt-40 heads. I found this huge junkyard near me. They let you take the heads off any car for 40$.

93-95 Mustang Cobras and first generation Lightnings 93-95?

Also, the 96-up 5.0 Explorer had the GT40P heads. They also have intake manifolds that flow about as well as a Cobra.

Good luck!