Manifold Vacuum Advance what am I not getting?

Bewy said
Turk,
I know your engine would idle better with more timing because I have doing this for so long.

It is called experience.
Pay for my plane ticket & I will come & dial in the idle timing..... the proper way.
One engine I tuned, close in specs to your engine: 11.3:1 CR, alum heads, headers, T2, Holley 950, 254/262 @ 050 HR cam, 108 LSA. It idled best with 48* which was done by giving it 18* init + 30* MVA.
You keep going on with your NONSENSE about people picking the wrong cam/pistons. Maybe some do, but they decide to live with the decision [ & save $$$$ ] & tune the engine accordingly.
How many people reading this are building engines with 12.3:1 CR, 255 * @ 050 cam, tunnel ram with dual 800 carbs???????? Only one I know is YOU, especially if it is to be street driven.

The facts are the facts. Factories & racers alike use[d] MVA. And they didn't have 12:1 CR.....
Below is another one, four cyl engines...
They cannot all be wrong be wrong.

View attachment 1716282369

I just fixed an engine yesterday because some guy listened to bull squirt like this.

The guy that owns the car is lucky he wasn’t beating on it.

Too much idle timing and it ran like ****.

So how do YOU think adding MVA to it would make it run better?

Are you saying I should reduce initial to say 14 and then add in 10 with MVA to get it back to 24?

That would be idiotic.

Buy your own ticket, fly your *** here, bring cash and I’ll show you how to build engines that don’t need MVA in the first place.

I’ll say it again, you are crutching a bad build.

You are what happens when you read books and don’t think and test for yourself.

I mean, the books you read tell you to set power valve opening off idle vacuum and the main air bleed affects both ends of the fuel curve the same.

Part of that is your fault. Your reading comprehension lacks.