Whoa! Six years later and I'm working on a '74 GMC with a 250.
The 'burb's valve-issues were straightened out, and the truck got sold so I could put a downpayment on a house.
Then, a '66 Brand-X truck with a 240-cid found its way to the driveway, but was sold off due to my desire for another 'bolt.
So, I'm back, wiser, older, and my inline-six affliction remains unhealed, though some GM therapy is truly helping...