[MJN]

With such low miles on the engine- was it a rebuild or a new crate engine? Was the correct break-in oil used? It looks like the rings aren't fully seated- I would also suspect a blue haze from the exhaust with that much fouling.
Start with fresh oil change, new set of Delco plugs- R45TS will work and are hotter than R44's, take it for a good ride 20-30 minutes of highway, not around town. Get it working and the cylinders warmed up to seat the rings. If it hasn't had a misfire then I would suspect cap and rotor are probably in good shape still.