my stone stock 1978 E58 cop 360/727 came with the non-lockup hi-stall converter. it stalled at 2550 in my 38 plymouth coupe with L78 mcCreary's and a 3.91 gear set. i don't know the weight of the car,[it was over 3100 with me in it as i remember right] but best run was 14.99 @ 98.76mph [salem ohio, night air].