hello, I have just completed my first engine opening.
I did a complete gasket replacement in a nissan truck z24 engine.
Not too dificult but the timing is a bitch to get back in. The distributor and the cam tentioner / oil pump / rectal probe was difficult to realign to the crank shaft and the distrib. Had to make my own tool to adjust the tiny shaft to fit into the front of the engine and line up to the distrib. The head gasket was the easiest part .....look me up if u need pics or help along the way.. plan on a long weekend or a relaxed week of work....check into stretch bolts for the head and definately spray that copper sealant all over the head.