Join Date: Nov 2000
Location: Manitoba, Canada
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Re: stock carb swap to holley
Yes, you need an adapter plate. The old carter carb uses a much smaller bolt pattern for mounting.
If you would like to try rebuilding a carburetor, get one from a junkyard, remember what year, make, model, and ideally get one with the tag on it (partsman may ask for the tag number). Otherwise, price out rebuilt ones at your local parts stores. I'd ask for one for a 1980 CJ5 with 304 (to give them some numbers).
Any carb that is sitting in a junk yard could be pretty gummed up inside. Also, look out for worn out throttle shaft bores. These are a source of vacuum leak. I'm not sure how much play is acceptable. I'd say if you can see any play up and down, its not worth buying. They can install a bushing at a rebuilder, but its probably not worth trying to save such a carb as they should be plentiful.