From your post it sounds like you may be doing this more then once. If you are thinking about rebuilding more motors i would spend the time and money to do it right the first time. I would at least get the micrometers to do the bearing sizes. It is a pain in the butt to use plasti-gage to check out-of round and taper on a crank. I have been a machinist for almost 20 years and i still make mistakes. If you double check what the machine shop has done it will reduce a chance for failure. About a year ago a customer gave me a crank that a shop gound(this shop has been in business for like 15 years) Anyway this crank had .001" taper on every rod and main journal. The chances of finding that with plasti-gage is kinda slim.
look at msc ( www.mscdirect.com
) they have some good priced measuring tools that will work in your application.