[twobjshelbys]

What's wrong with a Paxton? They've been used on Fords for years. Low boost (4psi) is what was used on Mustangs in the day.

Turbos will require significant replumbing and the amount of space to do it with the side pipes is very limited.

But first ask why you think you need 500-600 hp? I bet you aren't using the 400 you have. (And I lived in Lyons and couldn't come anywhere close to using the 500+ in my Cobra. I have stated again that if I were to do another Cobra it would be a small block car.)