I bought a 66 with a 454 block. Short AFTERMARKET aluminum water pump. My question is...which pulleys should I have? The power steering belt wants to come off whenever I run the motor over 4000 rpms. The crank pulley is a 3 groove. 2 in close, a space, then 1 groove out about 3/4". Someone had to shim behind the alt bracket(drivers side) and also the p/s bracket to try and line things up. The crank pulley is also shimed out about 1/8". Any ideas? I'd like to put billet pulleys on, but I want to buy the right stuff the first time. Thanks.