total timing reading accurate with no load?

Thank you I did read into that, and I figured since idle was a light load as well it may as well get the vacuum advance by hooking to manifold vacuum.

What I can't seem to figure out is if the initial timing is bumped almost 10 degrees over stock, should I bump the stock idle speed as well? For my truck the recommended idle was 750rpm. After I recurved the distributer and adjusted the timing to 16 intitial, it bumped my idle up to 850. I'm wondering if I should just leave it at 850 or do some more adjusting and set it back at 750