Thank you for all of the input, when i ran small blocks i had a hot 383 never had it dyno'd but was easily into the 5's on horse and went thru 3 th-350's before i went to a 400 and never had a problem after that, the last time i had a th-350 built i dumped alot of money in it for it to last about 5 miles, i would never even think of doing another one when i can get a 400 built here for almost the same cost, trouble is finding a descent builder , none here will warranty there work