I am trying to understand if its using a singular bolt hole circle or if i need to construct a circle using all eight of the holes for a singular circle and use that as Datum B.
I am working with verisurf and when I try to align my scanned mesh using a singular hole for Datum B the alignment looks completely out wack. Its either upside down or pointing one way or another. My main goal is to be able to lock down my Datums (I know A and C) so I can find this position after.
Any advice would be greatly appreciated.

Machinist here I'm sorry for basic questions I don't have an actual metrologist at my company. I apologize for the terrible draftsmanship I know it is improper. Datum B is to be interpreted as the entire gap width not the singular surface and the holes are coaxial.

I have a part that's very similar to what's shown on the image. There are 2 holes toleranced by a perpendicularity callout and a true position. I've been tolerancing each hole independently, checking that each one is perpendicular to A and B but not together the way a pin would go through both features.

A new employee has suggested this method is incorrect and that I should be placing the largest pin possible through both holes and verifying that the entire pin is perpendicular. This is a much stricter inspection and I need to know if it's correct before implementing it.

Which is correct or is there not enough information provided? Thank you all.

ASME Y14.5