I totally agree with this. Nothing wrong with using manifold vacuum on the vacuum can if it runs better, BUT unless you fix the carburetor FIRST, you're just using manifold vacuum as a band aid.
Right. I have the rods for the carb coming that will lean it out. Just waiting for the mail.
It'll lean out 8% at cruise and power.
I just picked up one step hotter spark plug to try.
When the rods get here I'll take it on the expressway and get a clean shutoff and cut that plug apart. That will show if it's going in the right direction.
I really didn't want this thread to be another manifold vs ported vacuum discussion.