My car 1969 Dart about 500hp small block, 5500 stall converter
4.56 gears 29x12-15 slicks
I had an 9.5 4000 stall converter and it would 60' 1.69
and went 11.35 118 mph

New converter concepts converter 8" 5500 stall 60' 1.65 to 1.70
went 11.28 119.8 mph

Car has caltracs and split mono leafs with Rancho shocks on lightest setting I tried putting 1 click to firm in the shocks
and dropped the tires pressure to 8lbs and the 60' went 1.75

Not sure where to go from here with it , I would think the 60's should be in 1.50's ?