I've always used .0025~.003 on mains, close to .0025 on rods. Bearings always looked good on teardown. Just make sure when you put them in that the saddles, caps, and bearing backs are clean enough to lick. If you lick 'em, blow them off with air again after.
1967 Falcon 4 door 351C-4V
1970 Mustang 351C-2V
http://raceabilene.com/kelly/hotrod
Owner built, owner abused.