Down under, where the 351 C is a very common engine, this does happen.
I have had it happen many times over the years. must admit not with the std dizzy.
Not many of em over here run the std dizzy.Points are so ... last week !
Never had issues with the proper 3/16 roll pin, but other comanies use smaller dia springs, which don't help !
I try to use wherever possible std pump with std pressure spring.
This last engine we did has a bit of extra clearance in the cam tunnel and runs 10 psi @ idle which is marginal but 50 psi @ 2000, so we are leaving it alone
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