Originally Posted by gowser
I installed a 350TH from 1982 Capric Classic behind 1968-327 Chevy. My problem is at 1000rpms the truck stalls when put in gear. When I increase the RPMS to keep it running the truck jumps ahead when put into gear. As far as I know the torque converter is original. Lots of help needed thanks GOWSER.
Sort the timing
out first. This is especially important if the engine has a performance cam in it because if the initial timing isn't high enough, the carb primaries will be opened too far to get it to idle and that can cause the problems you're describing.