In addition to my loose wrist pin woes, I also have crank bearing clearance issues. According to my Plastigage, the majority of my clearances are in the .003" to .0035" range. The machine shop and an article I read said bearing manufacturers make bearings that are smaller than the standard undersize bearings to help dial in oil clearances. IOW, a bearing .001" undersize for a .030" undersize bearing would be .029".

I went to Clevite.com but didn't see any.

Anybody know if there are this type of bearing made for the Pontiac?

Seems there's every size bearing known to man for a chebby but not much for a Pontiac. I bought a set that were one thou thicker than standard to eliminate the one thou over-bore the machine shop did on my main saddle bore. I think I got them from Butler, they may have what you need.
Are you sure all your pin problems didn't start from an oiling/lubrication issue?

That was one of my suspected problems. I checked the oil pressure before I tore it down. Cold: 40PSI @ idle, 60PSI @ 2,000 RPM. Hot: 20PSI @ idle, upper 50's at 2,000 RPM.

I don't think oil pressure or lack of splash lubrication on the cylinder walls caused the loose pin. The rest of the pistons are great looking. They better be; they only have 1,000 miles on them.

However, the cylinders seem worn. Almost no evidence of crosshatch, which I figured there would be. My 83 Camaro 305 was torn down at 150,000 miles to re gasket it. Could still see crosshatch. Still have the original pistons and rings. Didn't remove them from the block.

I have never tore down a newly rebuilt engine, so I'm not too sure how much wear I should be seeing.

I'll have another post concerning the wear I have seen on the bearings and cylinders.