Okay, with the head off, the only way I've ever done it, as both valves start to close you bring the piston up and STOP 3/8" BEFORE TDC. If you were going to TDC a then bringing the piston down you were timing it AFTER TDC. Wrong. You can go to TDC and back it off against the direction of normal rotation but why bother? It's pretty simple to do. If you have it timed to fire 3/8" after TDC then it's no wonder it runs like crap. If you go to TDC and back off you have to go a couple inches backwards and then forward (up) to take care of gear lash. I've done this dozens of times. I don't know which manual edition you have but the older ones made it clear not to go past TDC- past being beyond TDC in the direction of normal rotation.
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