A few 250 questions

[T and S]

Finally started working on my in liner, clean-up, paint re-gasket, etc... It has electronic sparky, weber carb, stock intake and exhaust manifolds. It has been sitting in my shop a little over a year. I haven't checked compression, but motor feels good turning it over, seat of the pants feel.
I pulled the plugs, the center 2 look good. Outside 2 on each end had a little oil around the threads, I figured valve seals leaked down some, and also looked like it may have been running a little rich.
Friend of mine has a cam that he bought for a square body back in the 80's (he told me the lift on it, but it slips my mind ) I could probably get for free, it has never been used. I picked up this motor from a guy here on the boards, I don't know much history on it, but I heard it run in a video.

Should I: A) leave it alone and run it stock.
B) install cam and see what it does.
C) install cam, headers. Will I have enough carb for that ?

I don't want to open a bucket of worms, I want it to be reliable.