Randy,
I did everything you'd mentioned. The only block rework was flaring the openings at the adapter, 7/16 pump to adapter change and that at the bottom of the block where the oil pump mounts. I also went to the '68 oil filter adapter Holley 70 jets for restrictors and an HV pump. I have 80lbs cold, 38 hot at idle and about 68 at 3200 rpm. Not bad.
-Keith