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In my limited experience cylinders #4 and 5 are the most vulnerable to vacuum leaks and manifold leaks so at least the location is right. You may have something a simple as a burnt valve. If you have burnt valve, you will need to pull the head, which also involves pulling the intake/exhaust manifolds. There are plenty of posts on that...do the search.
Are you in a smog test state? You might want to consider a desmog, but do it right and do not expect it to be a non-expense procedure. Plan on about $500 including a carb rebuild.
Read a lot of the posts on the subject of manifold gaskets. Most board members favor the Fel-Pro manifold gaskets.
In regard to carburetors, if you send your carb to Jim Chenoweth it will come back ready to bolt up and go. If it still runs rough, it will be something else, not the carb. Downside is the $300 plus shipping and the down time on your rig. Upside is a carb that is right and someone who can give you great advice on getting your cruiser running.
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86 FJ60, Champagne Bronze, 33X9.5s, Desmogged, Dynamat, ARB in rear, 4.11 gears. OME lift, bedliner on rocker panels. Tint.
1987 FJ60 Dark Blue Metallic, 31X10.5s, 130K, Desmogged.
"Assumption is the Mother of all Foul-up"
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