I had a similar issue with my 67 L79 Vette. The VAC was hitting the intake causing me to not get the initial timing set correctly. I would wager that the drive gear is out 180* as TWB said. This is an easy fix. After you pull the distributor take the correct punch knock the pin out align the rotor point to the indention on the gear reinstall. In my experience my car ran a lot smoother at idle. I could dial in the timing so much better. I would expect you will have the same experience and your tach cable will not be in a bind.
Good Luck
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65 Corvette Coupe L78
67 427/390 Vette Coupe unrestored
67 L-79 Vette roadster (Top Flight)
69 L71 Roadster Survivor
69 L46 Roadster Survivor (Sold)
69 Z/28 RS
69 Dodge Charger R/T
70 W30 442 Auto Air Survivor
2016 Z06 Coupe M7
70 AAR Cuda (Sold)
69 L78 Chevelle
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