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How many teeth on the flywheel/flexplate? A 153-tooth wheel (12-3/4" in diameter) uses a starter with mounting bolts set in a line perpendicular to the centerline of the starter shaft. A 168-tooth wheel (14" in diameter) needs one with bolt holes set at an angle to the shaft.
A '68 307 could use either size wheel, depending on original application, with the larger one generally found in heavy-duty applications (taxis, trucks, cop cars, anything using an 11" clutch, as opposed to the standard 10" one used on Chevelles).
The motor part of the starters from that era would accept a snout (starter drive housing) with either mount bolt pattern, and yours could have been changed out sometime in the past 37 years, so the number might not help you.
If the "parts man" is giving you a starter with perpendicular mount holes, tell him to try one for a pickup truck, and see if that one matches. Don't give them the old starter for a core until you're sure the new one actually fits and works. You might be better off getting the old one rebuilt at at auto electric shop.
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