Just copy a big Detroit engine and you should be close. Take a look at the specs for a Caddy, Olds, Buick type of engine and copy the cam specs and compression ratio. It sounds like that is what you want. A 470 inch short block will give you the cubes then use a mild hyd flat tappet and you should be good to go. You won't want a very big cam, take a look at the cam that Chevy uses in their 502 street rod engine and you'll be surprised at how small it is. If you use the same cam specs in your 470 you should be fairly happy.