There are a few things with the Edelbrock AFB's that I dont like or have had issues with. #1 is the calibration out of the box may be fine for a 350 Chevy , but the manual choke versions are a little too rich and the echoke versions are too lean. They do tell you that one is calibrated for economy/emissions and the other for performance and what you see in the jetting specs for each looks like it is only a jetting/metering rod/spring change. You find out when you start looking at them that the air bleeds etc. are way different. Overall the manual choke versions are a better choice with the ebrocks. #2 the air valve weight balance is doesnt work to well on a single 4 Pontiac application and comes in to soon. usually anywhere from a pop too a big bog. #3 I have had needle seat issues (leaking) after about a years use. Edelbrocks standard replacement is worse. I havent tried their off road needle/seat assemblies yet.
Your 800"AFB" is an AVS. I havent tried the Ebrock version of the AVS and cant comment other than it is a step in the right direction. I have had good luck with the MOPAR versions from the late 60's early 70's. Im looking for a few cheap used ones.
I agree with Jon that the "Pontiac" AFB's are a better choice as well as the older Competition Series AFB's. The only thing I feel is an improvement on the Ebrocks is the accelerator pump and elimination of the pump/float well check valve . No more shrivelled leather cups or stuck check valve. Oh the Ebrocks are shinier too.
The main reason Im using them is because I have them. I got 2 of them FREE and my other 3 I paid $50.00 or less each. (The $50.0 one was a manual choke 750 that was on a 305 Chevy for 1 week essentially brand new. The owner claiming he'll never run an AFB again he bolted on a 600 cfm Holley vac secondary and thinks its great). The other carbs were suffering from maladjustment dirt and stupidity.
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