Offy says anywhere from 390 TO 500CFM. You MAY be okay, but it is undersized and will starve the engine some. You'll still have a two barrel carburetor with an adaptor plate.
You have choices. Holley makes a 390 CFM 4 barrel AND they make a 470CFM "Truck Avenger" carburetor that's specifically set up to work when it's far from level. That's the carb I run with my Clifford intake which has similar CFM requirements.
But there's other carburetors that run great built by others as well. The Weber 38 draws enough and is actually recommended by Clifford. But it is a two barrel carburetor. You might want to contact Offenhauser for their opinion of putting a two barrel adapter on the manifold.
Edelbrock makes a 500CFM 4 barrel. It's been around for a million years and used to be made by Carter before Edelbrock took it over. Mine was a Carter, but it was the one I pulled because I felt it was too big. If you want it, you can have it or what it costs to ship. But know this... The manual choke needs rebuilding and the carb needs to be rebuilt. I have no idea what jets are in it but I'm sure they're probably not the ones you need. I'm at 5000ft and am sure it was rejetted just for the difference in altitude. It needs work. It won't come out of the box and just bolt on with good results.
Personally I like Holleys. Others don't. I think they're easier to work on than others. Others disagree.
If I remember right you want to DD the Jeep? These aren't going to help your mileage any. They're all (including the manifold and headers) designed to boost your horsepower. They draw more air than a stock manifold, and that means they need more gas. If you want better mileage, you may want to go back to the stock manifolds and stock carburetor. that would NOT be my choice.
I leave for Montana tomorrow afternoon, so I would need to know what you want on the carburetor. Personally I'd go with either of the Holleys. The 470 for off roading.
Others will chime in I'm sure.
I'd rather be lost on the trails than found at home!
Phoenix Rising- A Flame Off Restoration?
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