Thanks, hopefully I can get to it this weekend...I've got a lot of irons in the fire right now.
BTW, I got the balance factor from a)the "58%" stamped on the flywheel, b)several sources on the internet and c)the fact that the .040 over pistons, rings, and rods came out to 58%. BTW, I could not find a BSA source for the balance factor, but service sheet 712X gives the balance weights as 18 oz. 10 drams (538 g). Given those weights, it was pretty much right on 58%.
Also, the oil in the sludge trap doesn't really make any difference. It adds a calculated 8 grams to the total big end weight of more than 1000 grams. Less than 1% difference - I don't think it matters.