[Ant]

After many months of trying to sort out what size engine I will go for, I think I am on to it!
Bearing in mind going road racing is top priority, not drag racing or grunty road use!

331 because of reliability, rod ratio, SOUND/REVS. It will have to develop around 460-480bhp for my application.

Going to 347/355 is just lowering the rev range and reliability.
Heavier 351W blocks and the 393-427 loads up the drive train, reduces the handling, don't sound as good.
Big blocks are nice and have bulk torque etc, if I had the $$$ another FE but all alloy would be the ticket, or an all alloy 427 GM would be great eh - Bevan!