Good day to all. I am currently in the process of checking my ignition. To be precise, I am checking the adjustment mechanically and with vacuum. I can not find any values which are correct for this. It is a 440 cui from 1977, at idle (780rpm) I have the 12° before TDC. Without vacuum, the mechanical adjustment goes up to 35° at about 3000rpm. What values are correct with vacuum when I have this connected to the timed vacuum port on the carburetor? Or in other words do I even need the vacuum port? I bought the car without the vacuum port. The engine is completely original.