You may be right, the original cam was 325 HP at 4,800 and 445 torque at 2,900.

The new cam is 360 HP at 5,100 and 445 torque at 3,600.

I'm not sure how to calculate the best stall speed, rough guess from the numbers seems like I should bump it up 300 to 700 from the stock converter(?). I've seen 2700 rpm mentioned on some of the drag race books but I don't want to ruin the streetability.

Modulator sounds like a safe bet, I hadn't really considered it since the trans was rebuilt but don't know what else it could be. I'm researching these two items...