327 serious problem

[Flying Undertaker]

Check the distributor for mechanical or vacuum advance problems. I've seen first hand where the nylon bushing under the mechanical advance plate where the weights and springs are located crumble and become missing allowing way too much mechanical advance. Try things that do not cost money to begin with. Also check valve guides in head for oiling issues, look for cracked seats in heads. Check oil rings placement and gaps. Also check end gaps on compression rings. For 100 miles, that's a lot of oil on piston tops! Thanks, Don.