Like I said, the HIC is blocked off. The metering rods move freely, and are down at idle.

do you have any experience with changing idle feed/jets in any carbs?

The holly must be duel feed? Square bowl will fit with stock coil bracket, and I wouldn't put the tq on with an adapter. So find a 440 tq intake, less hassle since all the linkage and choke hooks up factory.

The root cause is the design. These are emissions carbs intended to run lean and they do; drivability problems were well known when the cars were brand new and today's gas exacerbates the original problem.

yes it is an emissions era carb & is lean & tweaking the innards does work excellent to fine tune em spot on but it can & will run at least on the idling circuit fine for the most part without em (& OP has a mild cam). there is another problem going on that needs to be fixed (something is severley damaged/leaking etc). I cant see fine tuning the innards with drilling fixing what is damaged. Like the one guy posted & my exp with em, they are fine but can be made better. if drilling mods fix this carb I'll be the first to admit I was wrong!

I'm with Lew and John on this one...... Drill 'em out.

Emission carb, in 1969?

You bet. All factory AVS's (Mopar started using them in '68) are emission carbs.

AGREED! Finding a good TQ is one thing. Getting parts to tune it is the other trick. Once you have a good TQ carb tuned in, there really quite an excellent carb. IMO, perfect for a street strip application.

A Holley is the easy way out. And I wouldn't blame a sole for going to one.

The TQ a least has the right Chrysler linkage, not a bandaid adapter.

B5XP29, FOR SURE holler how the AVS turns out! what you did to it/how it acts now. Inquiring minds want to know.

I ordered some #63 drill bits (.037"), as nobody local carries them. Hopefully they'll be here by the weekend. If I can't get the AVS running right, maybe I'll try the thermoquad. Thanks to everybody for the advice/suggestions

One of my favorite cars. Rode around many a nite in my friends 69 RT, forest green, he bought the car right off the showroom, paid for it himself.

The best bet is a brand new Holley 750 Street Demon, $346 delivered to your door. It looks a lot like a Thermoquad and has the latest metering ideas.

R.

Not interested in something the "looks like" a Thermoquad.

Question is, does it SOUND like one?

I like the Edelbrock 800avs in an application like this.

Well, it worked! Drilling out the idle fuel jet tube to .037" did the trick. It has never idled better. Smooth as silk. Who would have thought something so simple could have done it. Thanks to everyone that offered up the great advice! Gotta love Moparts! 👍

I also agree with you guys. Does anyone know what size the economizer or the other idle feed restriction is ? I take it that it is larger then the lower idle feed restriction at the bottom of the idle tube since drilling the idle restriction at the bottom of the tube helps and makes it richer ? Ron

Interesting , Awesome To Hear

By drilling them out , could you actually have cleaned them out , as in dirty or plugged ???

My 4640sa starts and idles perfect stone cold , idles cold with no choke not even touching the gas pedal , running the Mopar 284 / 484 Cam , transition off idle beyond smooth , I don't even want to try this , if not broke don't fix it ,since the many times I opened it up playing with jetting and fine tuning it

Anyways makes the Edelbrock 1407 that it replaced , man what a Headache that 1407 was , biggest POS carb I ever worked on

Not a chance. This carb couldnt have been any cleaner. I always clean all passages out with torch tip cleaners, carb cleaner, and a blast of over 120psi of air. Not every carb needs to be modified internally, but I guess this one did. Like I said, it has never idled better or cleaner, I leaned out the primary cruise step and fattened up the secondary jets while it was apart. Plugs look good, pulls harder, and idles great.