I just went from a Torque Flight 727 to a A833 4 Speed. I had my 727 Completely gone through- one or two smokey burnouts in the driveway. Slams second hard, and a healthy hit in third. I doubt you can use the 3000 Stall Torque Converter I had built to match my 10.5:1, Lunati Cam'd, 1967 383HP...