I am looking to buy a new Convertor for my buick, Let me explain my setup and maybe one of you can give me advice. I have a 72 Buick GS with a 400+ HP buick 350. I will be running a 200 4r (low milage original with Shift kit. and 390 gears. I am wanting a 2500/2800 stall lock up convertor. What convertor and by whom would ya'll recommend