I have the case buttoned up and torqued to spec for the 2056. The rotating assembly and the cam move like they should. I had a little trouble getting the oil pick up tube alignment but everything else is smooth. Next I dropped the drain sump cover and screen in. Moved on to put the taco plate and sender in. Up next was to install the oil pump, NOT happening . So I look at everything and it looks ok, I don't see any to keep it from going in. I know it is a snug fit . I took the pump over to the wire wheel and evenly buffed around the pump housing 3 different times. Put some lube on the housing and the case, still no go. Case was line bored but it should not have made and difference in the oil pump area.

Keep buffing it down?

Stop buffing. Make sure the pump drive tang is slotting into the cam. Hell, make sure the pump is going in right side up. Try loosening the case bolts on either side of the pump. Do not force it, but it may take some gentler "persuasion" to fully seat.

This is not my 1st build. I have done about 15 engines. Pump is right side up and tang is lined up with camshaft. I will loosen up the case bolts tomorrow. I have never had to do that before.

Cam thrust right?

It happens.
Did they mill the case halves?
Otherwise, measure it and see if it will fit, then loosen the bolts.

And?

Waiting on case spliter for oil pump. Should be here tomorrow. Case would not budge. Did not want to mess up anything having spent $600 on having case machined.