Clifford makes a manifold for using a carb on the 4.0. Runs about $280 IIRC. I have had zero issues with mine for the past 3 years. For me, it was money well spent.
1986 CJ7, 4.2 w/4.0 head, TFI-HEI hybrid ignition, Clifford manifold w/Holley 390 w/cold air intake, OBA (in work), 150 amp alt., 4.5" lift, Woody CV shaft, 4.10 gears - lunchbox in front, Truetrac in the back, twin-sticked, blower upgrade for running topless, keepin' it simple.
It's just a Jeep, and if you don't wheel it once in a while, it's not even that.