727 build help

I can almost guarantee you need more stall than 2800-3200 if your 360 really puts out 650 hp and it's a race car. Heck even I have to use a 3,000 stall in my 400 hp 360 street car. The only correct way to size it to a 650 hp race car is the way Moper described. Even if you don't choose to use the supplier he mentioned you need to go with a top company.