I'll 2nd this recommendation! http://dynamicconverters.com/aboutus.htm They aren't the cheapest...but, Frank knows his stuff! I bought a 3,500 stall 9.5" converter for a 727. It was in a '66 Valiant running a 340 (284/284 purple shaft). At first I was worried about a 3,500 stall on the street but, he assured me that it would stall closer to 2,300-2,400 if I wasn't full throttle off the line. He was spot on and I'll be darned if that car didn't get 19mpg at 75mph. I had planned to put 3.23 gears in it but, living out west, I left the 2.96 gears in it and it still left great off the line....not to mention I could cruise at the 75mph speed limit out there! If I ever build another automatic car, Frank has got my business again! Also, keep in mind, this was after I had wasted a couple hundred on a Mopar Performance torque converter...JUNK compared to Frank's! Save up and do it right the first time. :-)