Couple options: You can take a couple pieces of chain and a turnbuckle and tie the left side of the motor to the frame like 1stGen suggested. That's what folks did before the steel or interlocking motormounts came about. Or you can use solid motormounts. If you do the latter, do NOT use a solid transmission mount or you will end up breaking either the belhousing or transmission case when the whole thing twists. The solid mounts will transfer more vibration to the chassis, but hey it's a hot rod right?

Pat