Meal, I need your advice again. My 67 Chevrolet Impala ran on 7 cylinders. So I turned out all spark plugs. The spark plug from the 7th cylinder had strong Plack (see picture). I type on piston rings or valve guide. There is a similar post however I wanted to know from you whether it makes sense to buy an outdated 305 or to have the engine overtaken. Since I can’t repair and can’t expand the engine, you have to I have everything done and that would be really expensive What do you think about it? I come from Augsburg in Bavaria. Thanks and greetings Markus