well the main reason to get a hi stall is to get into the starting power band of a camshaft, i have a 30/70 cam and its power band is between 2200 and 5200 rpm which is pretty good for a dd and matches the stall converter. if u have a stock cam i would not worry about a hi stall as u will lose the sence of torque down low and the engine will run out of puff, in other words ul be like ''**** ive got this revvy motor but not to much happening'', see with a hi stall (eg mine), it goes straight to 2000rpm or so with not to much speed hapening and sence of torque after that things get moving.. its not bad though, but in all essence a stall converter has to compliment the motor package, if that is done u will get the most power down to the wheels. im not to sure what a stock stall converter is, 1200-1400 etc, so best ask a automatic transmission joint as to what rpm it works at. saying 1500-2000 may not seem like much but it is, so choose wisely!
-Cam