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1976 F-250 460 with Edlebrock 750 on top. First rebuild; 35-40K on it in terms of mileage. Presently using a quart of oil ( use Rot-tella 15-40 and only that since I had it built) in 185 miles. No smoke! Only smokes on start up and even then a slight blue hint of color. According to the shop that I had it taken to , he tested only two cylinders(holes). both showed 120 compression when dry. When wet compression shot up to 155. He's claiming it is rings not being seated. In the last 14 months it has presented itself with this issue and I wasn't all that concerned. Now things have changed as I may have to move and this truck is the only means to get me to where I want to be. First things first: aside from doing a full tear down on it, what are my short term fixes, if any? I've read other threads in other forums which indicate Bon-Ami cleaning powder? which I disagree with. Or the use of Marvel Mystery Oil ( I've no idea why) . This engine has a lot of power left in it and its not abused or over used. If anything its under used. I only use it for long hauls and heavy loads like dragging my 38 foot fifth wheel from point to point. I could really use some help. Please.