Ended up working on Dad'* GA.. yuck.
Started pulling the motor in a 4.2L GMC Envoy. wish I knew some tricks on that one. GM FSM starts the procedure with "1. Remove oil pan bolt and drain oil. Replace with a suitable plug". When you figure out WTF that means.. you will have done an Envoy motor.
You haven't worked on one yet. You know how doing a 2.8L or 4.3L engine in an S10 always required some magic to get at the top belhousing bolts. Imagine worse. You take out the drain plug to gain 3/8" and...you could use another 3/4" or more. It'* ridiculously tight.