Hello all, 1970 NZ assembled sedan in tidy condition that looks like now needs engine rebuild as oil fouling 2 of the spark plugs. Not burning oil or using too much. Ideas of cost to rebuild in NZ or should I just grab one from a wreck or go the 504 change out route? Can do engine swap at home, can’t do rebuild at home as that’s too hard for me. Or...just pop hotter plugs in and live with it?