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For the rings, do what the manufacturer says. If you did not get directions in the packet, call them up. Also, it depends on the piston material per DJ. Google Piston Aluminum and research the issue. Trouble is, you will probably not ever find out what your pistons are made of if bought from some local supplier. (Using Chev and other stock pistons was fine back in the day but not necessary today. Check piston/crank offset, reversing piston offset, etc. The suppliers have the size you need without the problems of ring clearance and piston offset.)
Anyone getting oversize pistons today should get them from the usual suppliers who can supply the specs and about anything you need for rings, etc.
If you want something custom, light weight, small rings for racing, etc, go the Ross, J&E, etc so you know what you are getting. Different materials requires different clearances depending of use. Research this before you spend the money.
On the bearings, do what the insert machinist says so you can go back to him when they fail. Agree with DJ, .003 is too much bearing clearance. .0015-.002 on mains, .0015 on rods. Do you have full pressure to rods and mains?