Manifold Vacuum Advance what am I not getting?

Newbomb Turk said
They can’t teach it because in MOST applications it doesn’t work.

Although one guru says he can make it work in anything.

Of course, no one who actually gets paid to build and tune engines believes crap like that.

I know I sure don't. I take every combination as a complete new case, because even if exact builds, their tuning needs could still be different.