I have found a crank that the guy says is a 312. I am not sure it is a 312 as there is not a dimple on the rear of the crank flange.  Is there another way to identify a 312 crank that is out of the block.  The crank looks pretty good but would need ground.  He wants $200.00 for the crank. He has a number of older cranks from a machine shop that clased here.  Any help would be appreciated.  Larry  

Larry