Ported or manifold Vacuum to Dist.

I'll check my '67 FSM for that carb.
'67 AFBs, Vacuum advance connection is pretty high.
upload_2019-10-11_21-52-24.png

The spark port is about middle of the transfer slots, way above the idle discharge port.
upload_2019-10-11_21-56-8.png

Be interesting to see if other versions were different.