piston rings

I'll check the compression first. I got 4 plugs that have foulers the other 2 are good. The engine was sitting for 2 years I got it from a guy down the road its a strong engine but the just knowing I have could plugs bothers me. Hopefully I just got to change valve seals. I got a intake manifold gasket I'm going to replace it when it warms up a little. Is it really that difficult to change the manifold gasket every thread I read it seems like a long process. Thanks for the help guys

It seams that most of us take the manifolds all apart. Clean, paint, do carb.... IF you are not doing any of that, I see no reason to separate them. Never done one that way, but should be able to take the whole thing off and back on as an assembly. Doing it that way it's just a matter of getting your washers back in correct place. If you disturb the studs, use sealant when putting back in. If it's a stock gasket now and it's not leaking, you should be fine to put back with same. Many of us go to Remflex or Aussie gaskets for a bit of insurance of not having to do it again.
My earlier post referenced info on rebuild. Doesn't mean you need to do it, but along with tips here, at least you can have the info to make more informed decisions what needs done as you get into it. I don't think you ever said what the year or mileage was. Or what your intended use is. That would all play into my decision of how far to go with it.