Weber carbs are expensive. They are good for street driven Jeeps but they suffer from float bowl fuel spillover that will stall the engine on steep trail inclines. Webers can difficult to set-up and tune properly.
The Ford 2100 or 2150 is a much more trail friendly carb, and costs much less. They are very common at the junkyard on 302 V-8's and rebuild kits are available everywhere.
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Motor craft 2100 is definitely the way to go with a 258/4.2 L. You can eliminate almost all of the vacuum lines that the old weber carb needed and you can buy totally rebuild and ready to slap on the engine. Auto or manual choke are available. MC 2100 will not disappoint.
If you are saving up for FI, then why not just blow $20.00 on a carb kit for the Carter BBD carb? They can just purr when kitted and have a pretty good punch for power. If you take your time, the kits go in easy and come with good directions.
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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The weber carbs work just fine. Mine works well enough not sure if FI help me that much more. Great mileage and no hick ups offroad. The price has also dropped about $100 they used to push $400 and are now under $300 for a kit. I would recommend the Weber34 or Weber32/36 they are both progressive means the first barrel opens first and then the second with more throttle. I hardly ever even hit the second barrel unless I am getting on it. The 2100 and BBD will also work but then you have a used situation. They all work well.
Jeesh! Just put a rebuild kit in it (good for around 50,000 miles, then repeat) and do some junk yard injection after this temporary fix.
Carbs always have been a maintenance hassle and always will be; do yourself a favor and get rid of that problematic bug sprayer technology.
...a well prepped, well driven, vehicle should do well in any terrain, including the highway.
Carburetors became obsolete during the last century... do what ever it takes to get fuel injection...It makes bigger grins off road.