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I would never buy a TQ from a rebuilder place. They pull them apart and rarely get the top, middle, and bottom from the same carb back together. Those sections have so many different part numbers. A lot of the sections are not interchangeable.
I think the 9104 is a Lean Burn, doesn't have the ported port for the distributor vacuum advance. I know the 9103 doesn't. Find any 72,73,74,75, or any truck TQ, or the electric choke 9800 series. The TQ wil out perform any Edelbrock in my opinion.
If I was going to buy a new carb, it would be an Edelbrock AVS2. But since I have 30 or 40 Thermoquads, a few NOS and several 9800 series with the electric choke-this is what I will use.
The white powder stuff is called bloom, anyone in the rubber industry knows that. I once looked at a 66 Belvedere 426 Hemi, with only 29 miles on it. It still had that white bloom on the door and trunk seals. The first time I had ever seen that on an old car.
Baldwin Motion used the 950's on the 427s in their Camaros and Corvettes, and I think that Yenko used them also-not sure about that. I have an old HiPerformance Cars from 69-70, and it showed one on a 69 427 Camaro.
I need to install a new gas tank on my 67 Coronet. What kind of pad is best, correct, or fits the best. Detroit Muscle has 3 or 4 different ones. Which one? Thanks.
Find an earlier TQ, get it rebuilt, and use it. that way you don't have to change intakes and it will more than likely, perform better than anything else you might put on it. Just my 2 cents worth.
AR Engineering has all of the neat taller brackets. Go to their website and find what you need and then go to Mancini Racing and buy the part or parts you need.
Get rid of the stupid-*** GM Q-Jet and put a damn Thermoquad on it so you can get your throttle and kickdown linkage set up the way it's supposed to be. There is no way that the kickdown linkage is functioning properly, so the transmission may already be damaged. Can you tell? I'm a Thermoquad...
There is a post over on FABO, dated Feb,3 2021, by BILL CROWELL, titled "Square-bore vs. spread-bore?". I posted pictures of the differences of the TQ adapter and the QJet adapter.