rough running ram50 1989 2.6 carb

[FMS88]

Welcome to the club!
The compression numbers you obtained are reassuring and indicate the engine is sound. Most likely the problem is the ignition, fuel or other peripheral systems. Has it always run rough since you got it? Were any repairs made before you got it or since you owned it? If there were recent repairs, keep those in mind. However if none, you're smart to start with a tune up, including new plugs. Chances are it just needs a tune-up. But if that doesn't fix it, you'll then be on a firm footing to consider and look for other causes that an out-of-tune engine would otherwise hide.