Zray that's very helpful thanks. Is it not worth getting my current heads ported? The cost of the stuff is not so much the problem as importing it and the tax and customs costs. Would alloy heads give the same result as those mentioned? If I could buy a set of those I lose some front end weight and could possibly use them on a future 347 build if I decided later that was the way to go.
15 years ago when I had a Paxton put on the 289 in my convertible the speed shop told me it took 50hp to turn it. Maybe they were full of it the car was decidedly weaker on the low end after the install.
Cheers for the info. Peter
15 years ago when I had a Paxton put on the 289 in my convertible the speed shop told me it took 50hp to turn it. Maybe they were full of it the car was decidedly weaker on the low end after the install.

Cheers for the info. Peter