the mech timing is for performance the vacumm advance is for fuel econome and drivabilaty if it is a stock 302 with lowcomp heads total mech...
just a thougt i had a 67 coug XR7 that had a 289 2brl c4 and a 28 splin 9 inch and yes it came that way right off the lot was not a spl order car....
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