The most miss understood transmisson idea is that a high performance motor needs a high stall speed converter corvettes come with 1500 stall speed If you have no low end torgue like in the sixties and 70s big long over lap non roller cam with no idle below 1000 rpm you need a high stall converter. If the motor will Idle at 600 in gear you want a stock 1500 converter If your running a 700r4 you can use a stock 1995 s10 v6 converter it has a 2600 stall speed and you should be able to get on from a tranny shop for $100 of less. I put these in street rod trans all the time Even behind big blocks with blowers