carb. crazzzzyness!!!!!!!!!

73AbodEE said

you are going to get a lot of opinions here but in my opinion, the 650 AVS thunder series will run perfect. i would stay away from the eddy 1407 750. i have had nothing but problems with them. the factory 70-71 440 magnum auto's came with a 4966 630 CFM AVS . if you must run a 750 , i would start over with a brand new holley and make sure it is set up correctly. this is what i will be running on my basically stock 440

Click to expand...

I highlighted the above due to the fact that it is a fact. The earlier 440's even came with 600 AFB's without a secondary air valve. It seems to me most people are not reading what you wrote about not racing it and suggesting some carbs that are to big to way freakin to big.

Regarding the 650 DP Holley you have now, if it is in good shape, I'd run with that. Focus on the primary side of the tune first and the pump shot delivery of fuel. If you need to change a cam on the pump shots delivery, that isn't to hard to do and the cams are cheap.

IF a new carb was in the picture, I would look at the 650 AVS or a vacuum secondary Holley.
I would not recommend a small primary TQ because the primary side is very tiny and suited for a 340 or less C.I.D. daily driver. Or a warmed up 318 or smaller engine. The stock 440 TQ's were the larger primary units. (Small primary @ 1.38 vs the large primary @ 1.50.)

After the 101 lesson above on carb and timing gets done, you should have it squared away. Though I think your fuel pressure a little bit low @ 5-6 psi.