I know how cheap I could build but a big block or small block to go the times listed. My preference for this build would start with a 360 block for budget and ease of working and fitting in the engine bay. My Sons 360 just went 6.54 (approximate 10.30's 1/4 mile) with a .030 over 360, flat-top pistons, a used 120 dollar roller cam, and ported Edelbrock heads. He had an issue at Norwalk (Sunday night) and pulled the head, sent it out, and it was back running on Wednesday. Not a cakewalk on an A body but sure easier than a big block in one.