How do you adjust timing on a 273?

Whoah...

Let's not forget that initial timing will change total timing and even more so with a vacum advance distributer. There si nothing wrong with that initial timing but ALWAYS check total.

My advice is to plug off that vacuum advance and just run mechanical advance. Wither way CHECK THE TOTAL

I am still getting a grasp on timing as a "whole", so I gave the OP, the 1st step as to what to do. More members on here know a ton more than I do, and I hoped they would chime in. For me it was very confusing on the differing terms that are commonly used when relating to timing. I was gonna say, "All in" and "total" were gonna be next...

To the original poster, does your distributor have vac advance??
What distributor??
Post pics