S10 Update:

I couldn’t find my compression tester, and ran out to Harbor Freight to pick up a leak down tester so I can stop borrowing them from friends. This is just going to be easier than a compression tester with the state the motor is in.

Bottom line: I have at least 2 bad valves that won’t seal.  Bent or cruddy?  Don’t know.

For anyone interested in a leak down test on a motor with the exhaust manifold and throttle body already off, here it is: