That '81 Camaro was probably a 350/350 or maybe a 305/350. What are you building and how will it be different than the Camaro?

Assuming you're working on an old truck performance is going to be similar to the Camaro with the same engine mods and tires.

1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...