I finally found a Holley 1904 carb to put in my Cj3a. Somewhere in its' history some PO put an F-134 in this low hood CJ3a flatty. With the Carter carb, it was several inches too tall which is why the Cj3B has the 'high hood' design...adding about 6" to the hood.
This carb gives me just over an inch or so below the hood line to create an air horn.
The only other 'mods' I had to do was use 3 gaskets to get the throttle arm to clear the engine block and put a small dent the valve cover to make room for the float bowl. You can see that in the picture below.
I'll also have to cut down the breather on the top.
Anywho, after looking a long time on the web, (including JCWhitney taking a month to tell me they were still looking for a core) I finally found a rebuilt from RockAuto.com. The had a rebuilt 1904 for $120 (+$40 core charge). That's nothing compared to new Holley 1904 carbs which were $450. Since I didn't pay that much for the jeep itself, wasn't gonna go there.
The great news is that the engine runs like a champ, nice and smooth. It does blow some smoke, so I'll have to chase that next, but things are looking up!