You have to ask yourself what kind of performance your after. A 455 with stock heads and 068 type cam will give you 370-400 hp. Some good porting and a performance cam can get you 450+ hp. Either way I think a stock 068 cam in a stick shift 455 is too small. The one upgrade I would make which ever way you chose is to go with forged rods. It just doesn't pay to use stock rods. By the time you clean, debur, polish, resize , install new bolts and balance stock rods you end up with something that's weaker than an inexpensive forged rod.
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