Vacuum advance on 318

Longgone said
Unless your car is modified in some way and/or you`re running a MP electronic ignition I would guess that your base timing would be closer to TDC or even a couple degrees ATDC.

My 318 was at almost 10* ATDC when I first got it. You never know, sometimes the timing chain slips a tiny bit or the distributor gets fiddled with.