What is a good stall to go with a 3:23 Sure Grip?

If it is that camshaft it is kinda lumpy. Apparently it’s supposed to be the same one as in the 402 I have. Therefore it ‘s specs are .501 .513, 230/234, 108 CL

You need more gear, and tighter 3000 ish converter.

When I had 4.30’s in mine I also had a full manual tti trans and looser 3800 ish converter. it was A rocket shop if you could get it to hook.

I since put an automatic valve bodied 727 with the 2800 and 3.23 gears. (only because I had both, but if I was paying I’d buy an 3000-3200 for this motor). I’m soon to out together 3.73’s ina 742 case I have.
The 402 has so much torque, over 400 ft lbs starting low (2000 ish) and it can actually pull it off. But I feel 3.73 with a 28" tall tire would be perfect for me.