Sounds like my '71 340. I used W-2 heads with a Mopar Dual plane. Racer Brown 286 cam, headers, 750 Holley, 3.55 gears, 3k stall, in a '67 B Body. Runs well. If I remember correctly comp ratio is 9.8 Tell your guy when he builds it to try to get that 10.5 it'll run better if you use a RB cam.