Im going to pick up a block possibly and I dont know if its been bored out, so 1 how can i tell 2 how what would it be stock, 3 how far can they be bored out, I want to make sure this block still has some life to it

 

Buy a micrometer. Most motors havent been bored but 20 over and I believe you can go 35 over, but not sure about that. Are you planning on getting the block Honed by a good machine shop? If it was bored, you should take it to a machine shop to make sure it is perfect.