[ChipBeck]

The biggest problem in a 427 or other big block Cobra is too much weight up front. I've driven both iron bock and aluminum block 427 Cobras and although I can't tell a difference in power the aluminum block cars steer easier and handle better. I think a 289 street car with an aluminum small block would be best of all. My Shelby American all aluminum 427 (CSX460)has been trouble free. In modern motors the only advantage to iron is that it's cheaper to build and buy. IMO

Chip