You don't have the car yet? I think it might be a good idea to buy the car before you build a motor. You might happen to find a car that already has a decent motor that you can add a few things to.
I built a 383 when I was 15 just to do it. It sat in the garage for a year until I found the 67 fastback project car to put it in.
The car in my avatar cost me 35 bucks in 1978. It was a complete basket case.
