I have a '79 Bronco which has 150,000 miles on it. It goes through about a quart of oil per week, some blows out the exhaust and the rest drips out the bottom. A mechanic told me that there was something wrong with the seal inside the something and thats why it was leaking. Anyway I was wondering if it would cost more to buy an engine(another 351) or just get mine rebuilt. The engine right now with some minor mods like a 4 barrel and performance headers, it hauls major ass. I've never had any engine work done and I'm not sure how much it would cost. So if you have any advice let me know.