Quote:

Quote:

(the factory?) left one off..





The factory never left one off. You have a mis-match of parts. cast vs forged cranks and balancers had different bolt patterns. Just file the one hole oblong so a bolt will fit.


WRONG - Ma Mopar did in fact change the crank pulley bolt configuration in the 70's. one bolt being offset slightly. No big deal, use a rat tail file and elongate it so that that one hole and bolt can be lined up. Big block the same way. Not a big deal, you won't be removing very much material. Been done many thousands of times.
If it is the pulley that you took off the engine put it back on in the configuration that it came off, it is one with the offset bolt and will go back on but ONLY in one position. It will only go on one way but it will go back on.