Big Block Tri-Ys

I should have mentioned that I think the Z bar is designed for a low deck motor (B block). I don't know if the geometry would be different on a 440 (RB Motor). That would be a question for them, but I'm sure somebody will eventually chime in that has done it and and can answer that question. I would like to know since I also have a 69 383 4spd S.