904 3800 or bigger convertor.

it was built for a 340 fully worked eddies, 549 lift solid, 4.10 gears, full weight street strip car , 10.5 motor had great street manners is a 9.5 ptc round a 3800 to 4200 convertor depending on motor and trans and gear, it was built with a little more slip in it to make up for thr 340 lack of torque, new stroker motor needs a little less slip that's why I am changing it car ran best of 7.20,s on motor with it and the 340:D