So that's the rub with the air grabber... it won't seal to the AAR hood?
One of my goals is to take the car on a Power Tour and it looks like it rains at least once during the week long run. I recently had the fish out in the rain here in Cali (with the raley hood). I would think the seal is important. Have you guys seen anyone try to seal it or come up with options? Maybe I could close the scoop with something on rainy days.
Also, isn't one of the ideas behind the seal to keep warm engine air out of the carb?
Chryco, the air grabber sounds like a cool option (they look good). I want to keep researching this to make sure I understand the pros and cons. Thank you 
Looks like you're trying to get the best of both worlds. I don't blame you, but it's not going to be easy. I also have a T/A hood, and originally wanted the air cleaner to seal up properly against the hood just like factory. I was going to use the factory 340 piece. After a lot of searching I couldn't find an affordable T/A base, and settled on the standard 440 Six Pack setup. Here were my considerations doing this:
1. Mine isn't a factory correct car, so no need to worry about factory correct parts.
2. The ram effect of the T/A (and I suspect AAR) hoods doesn't come into play until you're right around the speed limit anyway, and the seal would have to be perfect.
3. My car isn't a race car.
4. My car is far more likely to be caught in the rain than have a use for the ram effect, so keeping the air cleaner base unsealed keeps the rain water from flooding the element.
In your situation, your options are more limited. Since the AAR hood was designed specifically for the 340 Six Barrel, there was no 4 barrel option for the sealed base. You could use the single four oval air cleaner option which would give you the same benefits I have, but you wouldn't have the factory look or ram effect if that's what you're looking for. In order to have a sealed base 4 bbl you would either have to cut up and modify a steel 6 bbl base, or see if someone makes that particular combination in fiberglass, like Hybrid.
Here's a handy blurb from Mopar Muscle:
http://www.moparmusclemagazine.com/techarticles/engine/mopp_0212_air_cleaner_spotters_guide/photo_17.htmlAnd a few detailed pics from someone selling one:
http://www.2040parts.com/1970-aar-cuda-340-6-pack-factory-air-cleaner-assembly-six-pack-oem-i51101/
