Ok, one more question on the Holley jetting.

Mattax said
My inclination would be to install smaller idle feed restrictions - primary side.*
it would be good to know how much transition slot is showing at idle.
This is an Avenger 770?
Could be slot is too wide or too long.
Even if it is, I'd still start with with primary idle feed restricitons.
You didn't mess with the secondary idle position. right?

*It's easier to install threaded IFR than to press in new ones.
Before you do, might as well map out the various holes and restrictions.
It is possible the Idle Air bleed or a passage has something goofy going on. Shavings - a hole not drilled - you never know.

If the engine idles with less than 12 or 14"hg, its going to flow noticible more fuel as the engine gets more vacuum - up to around 14" when flow through the restriction will max out and things will act normal from there up.
This why I'd head toward IFR based on what you have written.

You'll need a pin vise and small drill bits to measure the holes (use the shank) and to bore a hole in the a brass set screw.
Hold the screw in the jaws of the drill. Go slow.
Also a tap set with bottoming tap.
Lots of info here
Relocating the Holley Idle Jet

How Are You Drilling Your Set Screws?

Yes, Street Avenger 770.

Now you are speaking the things I have been reading and asking about.
The transitions show near a perfect square and I have not changed the secondary idle position.

I have been reading and watching video's about all this as much as I can, so I know exactly what you are describing.
I wanted to check in with you guys before doing anything with the T slot feeds, even though we can believe everything we see on the net, right?:D
I have a pin vise as well as bit sets down to a couple of thousands, so no problem there.
I'll study up more and pick up some brass set screws of the correct size.
I watched a video of a guy doing exactly this earlier, so what you say and what I saw matches. :D

Thanks for verifying this for me.