My brother runs one on his new eng a just over 500 cube stroker. Its the first time he has ever used one so we dont have nothing to really compare it to. He ran 10.20's best I believe with a 499 and Eddy heads with a tunnel ram and two Eddy carbs. This eng is like 505 cubes I believe with Indy heads and the modman intake with the two Eddy carbs. Had to alot of carb tunning as it was very fat at midrange compared to the jetting the tunnel ram used. Has run 10.0's so far with that combo in his 3500 lb 64 Fury. Ron