Try http://www.skf.com/portal/skf/home/products they have details on thousands of different bearings. Instead of new bearings have you tried running everything on synthetic oil/grease. We did this to a mates drag car and with no other changes picked up 0.2 seconds in the 1/4 mile which is quite a big gain. Another thing do you still run an alternator. If you have to for the regulations leave the ajuster sloppy, then as soon as you're on the track the belt will fall off giving less drag on the engine.