Valve / Piston Clearance in 383

I would say you have more power in that combo. I have a 383, .030 over with trw flat tops, no valve reliefs around .020 in the hole. Using stock 516 heads with the small valves, holley street dominator intake, holley 750 double pumper and the mopar 284/484 cam installed straight up. With this combo my dart had been 13.20 with a 1.91 sixty foot. Oh yeah, and this motor was using water and my compression was down on cylinders 7 and 8.