The engine was a pushrod hemi. Back in around 75, I bought one with a leaky head gasket for a very cheap price. Replaced the head gasket, and sold it back for a decent profit. I didn't have a feeler gauge, so I adjusted the valves by "that feels about right".
1979 Fiat Spider (since new)
2005 Lincoln LS (the wife's car)
2003 Chevrolet Cavalier (daily driver)
1999 Honda Shadow VLX 600
1972 Grumman Traveller 5895L (long gone).