Not Ranked
I have recently experienced similar problems. I changed fuel pump, rebuilt crab, checked my lash (.015/.018 solid lifter cam very close to yours).
Finally, I changed the two fuel filters when examined had small black specks (lead) from when I run race gas and the pump gas had broken down the lead while setting for relative long periods without driving (several weeks).
My timing is set at 38 degrees and runs quite well now on race gas. My idle is a lumpy idle at 900 rpm.
Good luck
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