I think i broke rear main bearing

Dave_J said
I have always bored my SB rear main hole out to 1/2 inch and then taper it some and do the same to the NEW oil pump. I do use the paper gasket but spray CooperKote sealant on both sides.

I then use a flat plate with emory cloth and WD40 to lightly dress the oil pump and caps mating surface. I do lazy 8's making sure I keep them square.

Most pumps will clear a factory main cap bolt, even the HV ones. But they will hit most cap studs like ARP's

I went back and looked at the op's initial picture and you are correct, it is the factory bolt with plenty of clearance.
I am currently assembling a 340 and used arp bolts with their washers which stick .020 above the pump mount.
I will definitely check clearance with the pump when I get it.
Not the best straight edge, but it works