I come up with a 75 if I'm not mistaken. What's the hole about? I think it's been rebuilt once. Could this be the reason or to mis-represent the year? Not sure as I attained 7 heads with it and wanted to keep the block if it was matching. If not, turf.

 

wow , yea that don't look right , like someone drilled the numbers away .

 

Yeah, not sure. I think it's a 5 under the funny stuff.