I was having issues with my engine being kind of "doggy" since it has such a high rpm range and a stock converter in the th400 trans. So I took the stock 1300 rpm stall from my 400 trans and installed a b&m holeshot 2400 rpm stall. Wow, what a difference. The best way I can describe it would be....with the 1300 it was like taking off from a stop in 2nd or 3rd gear, but now it will set you back in the seat right off the bat. I highly recommend it if you havent done so, really lets the engine get to the rpm band quickly. Now I need to get rid of those crappy 3.07 stock gears in the rear end and stuff in some 3.73s! That'll get her movin! Chevy rocks!!