Reply to "Stock Autolite Carb problems"

Marauder, you have a long, tough row to hoe in finding a competent tuner that can deal with your Autolite 4300 from the late '60s/early '70s. Most carb tuners today work with Holleys although a few work with Demons and Edelbrock/Carter AFBs. Next is a competent Weber carb tuner and maybe Rochester q-jets. The least worked upon carb seems to be your Autolite, or the later Motorcraft equivalent. Indeed, there aren't many top-line carb tuners of any kind these days since the advent of cheap DIY EFI kits (all based on a Holley baseplate).
There are some do-it-yourself kits available for Autolite/Motorcraft carbs, but if something is broken or missing inside the assembly or in the linkage (or the kit), the DIY-er may not notice and the kit will be wasted. Lots of old Autolite/Motorcraft carbs are available free for the asking from Ford owners, which says something about their popularity, but at least repair parts might be available that way.
Your local Library will have a Chilton's Repair Manual on file covering 1970-75 which might help if you are determined to get the thing running decently yourself.
A bad carb can be extremely frustrating. A few years ago, I spend 6 full weeks trying to get a modified Pantera to run decently. I swapped a total of SIX different carbs from my shop onto the motor, and the only one that worked acceptibly was a tuner-700 Holley DP from Judy's car. So in desperation I bought a second one- and from the time I first fired the engine, it ran perfectly. This carb was specifically modified to work on a 351-C in a Pantera. Something like 23 different changes were put into what Holley sells out of the box. Not cheap but worth it. Good luck in your quest.