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.
My bad. I'll shut it down on my end then. Don't forget about the pump shot on that carburetor. Lots of times, when you lean one out it will get a stumble off idle, because it may need more pump shot so keep that in mind.