Have a 1986 V4 110HP crossflow not VRO (not new to me) . Currently the engine runs only on the port/left bank (cylinders 2 and 4) b/c there is no change in operation when I remove the boots from the plugs on the starboard/right bank. Verified strong spark and even (but low - 95psi) compression accross all 4 cylinders. Have also traced fuel delivery with no apparent issues from fuel pump through carburetor, and overhauled carburetor twice just to make sure no random blockage anywhere. Installed new plugs and ran the engine for a minute to help with diagnosis. Plugs from cylinders 1-4 each look very different as follows: #1 - very black but dry insulator and electrode, #2 - somewhat dry but normal looking, coffee colored insulator and moderate soot on electrode, #3 - very black and very wet insulator and electrode, #4 - very wet and clean insulator and electrode (as if the cylinder is not igniting regularly). In summary, top plugs appear too dry, right side is black with unburned fuel/oil, and bottom plugs appear too wet. Currently my best guesses are reed valve issues, timing issues, or leaking crankcase/intake manifold gasket. any thoughts or suggestions that can help narrow down the root of the problem?