Jeep Wagoneer - Carburetor

I thought the 2 barrel was standard and the four was an option (I honestly don't know). Also, lets just say I got the Edelbrock outlined above. Would it be a simple case of plug and play or would I need new intakes and manifold?

I am not sure, would need to check with my guy. I haven't had the car long and just assumed two barrel.

In 1991 your Jeep only came from the factory with a 2bbl carb so NO the 4bbl is not a direct replacement and requires a lot of other work. My background is a grand wagonner fanatic with 9 of them and I am an auto tech at my fathers shop in IL. If you want more power, and already have the carb, then you will need to by an eldebrock 4bbl intake also, make sure to get the one with egr. They do make adapters to put a 4bbl carb onto a 2bbl intake but that completely cancels out the reason you put on a 4bbl carb. Obviously replacing the intake is a lot more involved than just the carb, but any mechanic can do it. There will be some rerouting of vacuum hoses, fuel lines, and maybe some slight alterations for the linkage as tennisshoes said. This jeep has no ecu to worry about. So either do your 4bbl intake and carb now together, or rebuild your 2bbl carb and put it back on factory 2bbl intake.

Thanks, I am looking at options for my 1998 grand wagoneer, so this article is very helpful!