Which way
I second the G body GM idea. The Malibu is most popular and resale value is higher.
You could save a little longer and get a back half Malibu set up for a BBC for less than $10K. I did. It should have everything already on it you will need except an engine and trans. This way you can start out with a sbc engine if limited on budget and move to a BBC later if wanted without having to get a better car.