My transmission builder recommended a PTC converter to me and I couldn't be happier. 3200 stall and non lock up. Cruises down the road at 2500 at 65 mph with a 3.89 rear gear with a 255 drag radial. Not too bad for a non lock up.
1987 Monte Carlo SS. 355 SBC 2004R non lock up PTC converter
UMI front and rear control arms. Strange 9 Inch, 31 Spline Axles, 3.89 TruTrac.