When you say "cylinder and screw", is that actually a short bolt? And did you remove the oil pump and PS balance shaft and replace the BS with a short dummy shaft in the oil pump? And did you remove the DS balance shaft and place an undrilled cam bearing in the front bore to block off the oil supply orfice in that front bore? That has to be done or you won't have any oil pressure to speak of. I don't remember timing the pump to the crank.

I might pull the rocker assembly to check for cam bearing wear (scoring in the head metal) from wandering metal from the balance shafts, a common feature of a balance shaft bearing failure.

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