I just read your advice on going down to a 411 gear ratio from my current 488. When I get the car back from the body shop I'll take the cover off and see what I have in there. My Chevelle is setup for a Turbo 400 but I don't have a transmission or converter yet. There's a transmission shop in Crete that says he can build me a Turbo 400 and order a 3500 RPM stall converter that can handle the power the 572 will put out. What do you recommend?