So I started the Falcon up the other day and it immedeately started running really bad. I found that it had a dead #3 cylinder caused by mechanical damage to the plug I used a bore scope and magnet to remove two small slightly curved rectangles of metal out. Further scope inspection showed a nice half crater along the edge of the piston. I'm deducing that the metal pieces are my top ring breaking as it fatigues from the non supported area where the crater is. I have no history on this engine other than its a 74 250. I found on Craigslist a 72 250 from a wrecked Mustang with 77k on the odometer. I have it disassembled on the stand right now. The bottom end looks really good for 77k no scuffing on the piston skirts. Cylinders all look good, cam is fine, head has been replaced with 69 head according to the casting #, Bearings all look good. I still have to mic everything to insure its all within specs. Then I plan to hone it and install new rings, bearings, oil pump and timing set. I know the 72 had the lowest compression and least HP rating. Will the 69 head help get me a little more power and should I consider in investing in a mild cam and lifters. Its a daily driver 62 Falcon, I'm a motorhead that likes to go fast but wants good fuel economy too.