going with an UR underdrive crank pulley and UR overdrive water pump pulley. My local 300zx mechanic said if the seals are not leaking then don't replace them. I have not made my mind up on that yet, but if it ain't broke don't fix it, right ? He says it's not worth the risk of damaging something. Thanks for the tips. I have the complete 60,000 kit and also will being doing the plugs and fuel filter.