What I have done in the passed before I bought the tools to measure bore and crank dimensions was to take the crank and block down to the machine shop and have the guy check them. He never charged me. By the way he didn't know me ether. This might be a option for you to try. Hopefully the machine shop will not try to screw you over telling you that the block needs boring and the crank needs turned. Be prepared , know what the stock dimensions and tolerances are, have them written down, take them with you. I had my block and crank in the back of my truck, the machine shop guy checked them out right on the tail gate. Also make sure the block and crank are clean. Hate to see ya spend good money on rings, bearings and gaskets just to have it turn out worse than it is now.