The best thing for that Carter is to use as anything esle but a carbuerator!!! For 119 bucks at Autozone, you can get a motorcraft carb that will run exponentially better than that carter EVER will. Of course, I did the swap as I was completing the nutter by-pass. Total cost of the project was less than 175 bucks. Been on two very serious trail rides so far and it has by far been the best carb I've ever experienced off-road. Even better than the 385 dollar webber!
What you need is a MC2100 carb w/ 1.08 venturi size (I used one of an 1975 CJ5 w/ a 304)
Mr. Gasket adapter PN 1875 (i think)
5 1/8" air filter assembly.
I'm telling you... ditch that Carter...best thing you can ever do for that 258
85 CJ7 Laredo Hard Top
33" BFG M/T
Moser One Piece Axles
D300, D30, AMC 20, 258 ci
Motorcraft 2100 swap
Custom front bumpers
Custom Rear bumper/tire carrier