Has the engine been rebuilt or are you using it as it came out of the car just with new gaskets etc? I had one back in the 70's when I was young and dumb just couldn't get rid of that tapping valve lifter. Couldn't seem to get rid of it buy replacing a lifter or adjustment. My father in law, an old time mechanic, ask me if I was tired of messing with it yet and I let him look at it. He said cracked piston around the wrist pin. I didn't believe him and pulled down found it as he said. Never doubted him again.
Larryw
