Started with a 383 SV and a Holley 1050 made something like 647 hp 615 Tq--installed the Weiand TR and Holley 1050's x 2 and immediately saw 687 HP 660+tq. Saw a best of 670+Tq with that combo which @ 470.9 ci is 1.42lb/ci on Shell V-power--pretty stout by any measure. J.Rob