I have had this carb since the car was in the fall of 1973. My father in law was/is an exceptional mechanic and he rebuilt the carb to really get up and go. This carb had absolutely no bog, or hesitation at all. It was quite the performer. Its been in storage for decades.

My question is: Im building at 440 that is .060 over and has a camshaft with an operating range of 1800 to 5200 range. I will running a 3:55 rear end ratio and the engine will be approx 10:1 and running a modest 450Hp range. I dont remember the CFM rating of this particular carb but I imagine around the 800cfm area. Will this carb work for this combination. I know there are Thermoquad lovers and haters out there, but this carb (which he will again need to rebuild) was fantastic all thru the RPM range. I fan a 4:10 rear end back in the day, and I can afford to buy and use whatever carb I want. I just had always the best performance out this unit.

Yes it's an 800 cfm carb and would only need a jet check/change to work on the 440 , place to start would be to compare the 340 jetting to a 440 that year and go from there .

there are some jets on Ebay like 101 pri/ 148 sec or so that you can buy to jet up or you can use a lathe to drill out your existing jets a couple sizes up. I would guess it would need to be fattened just a bit

1974 360 TQ's were actually the same cfm as the 400 and 440 carbs. They were rated at 850cfm by Carter with 1-1/2" primaries instead of the smaller 800 cfm 340 carbs with 1-3/8" primaries.

The carb with some minor tuning will work well on a mild 440.

I'm running a tq that according to the numbers is a 73 340 carb on my 440 now. Runs great!

iirc 1&3/8" pri is 800 & 1&1/2" is 850 but I think carb CFM ratings can be a little bit misleading. I think either one would work fine for you and they tend to be problematic so if you have a good one take adv of your good fortune & run it!.

I agree with many of the posts above. My advice would be to run it like it is first. You may find that bigger jets offer more power but it's something that you really can't guess and get right, you'll need to experiment. It's easy to drill out jets, not so easy to go the other way, and sometimes even changing original jets can be a bear,removing them without screwing them up can be challenging at times. My guess is that on a mild 440 your carb will run very well in stock form.

I've been looking for a aftermarket intake manifold to use with a Thermoquad on my 340. And there isn't much of a selection without having to using spacers etc. (Which I don't want to do because of hood clearance problems). Looks like there is also a problem with trying to use the choke setup on the TQ with a aftermarket intake.
Any ideas or suggestions?

You can get a holley street dominator. It will fit the TQ and it setup for the TQ choke. Another good one for a combo like yours would be a used edelbrock ch4b. It's a square bore intake but they cast them with enough meat around the carb pad so you can hog it out for a TQ. But IIRC with that intake you would either have to convert your TQ to manual choke or buy an electric choke conversion from demonsizzler.

I was wondering myself about hood clearance with the Thermoquad. I assumed with the Holley Street Dominator there would be no issue, however as with other carbs, I would image there would be clearance issues with the Edelbrock Performer RPM??