There motors run forever. I'd replace all the gaskets while your in there anyways...example...pull the motor.
Oil pan, front/rear cover gaskets, new oil pump, oil volume kit from a '04+ car, new timing chain/timing chain dampner, Felpro Head Gaskets, GM Aluminum Lower Intake gaskets, new coolant elbow, SC gasket/O-Rings, TB gasket...well...you get the picture. As for porting heads...I can get you a damn good deal...all you have to do is pay me his cost and cover your shipping...PM for more details if you want to.
