rritchey You run a loose motor. Your numbers are on the edge of the blueprint spec. There was a few things that I didn't ask.
Oil. Somepeople use a multigrade
oil, some a Mobil1, and some a straight
oil sae30. For your .0001 on rods the oil will have no problem taking up the differents. Bearings. As you know there are different hardness of bearings. I believe that the tri metals are what most of us run, but you can order softer or harder. I have not heard of any cobra with the orginial motor with out rebuild or freshing up go 100k. I know a friend with a countrey squire 390 with a 162,000 miles and only replaced the timing chain set and water pump, valve cover gaskets too. This car is not beat on and his wife is a good driver. The car does 70% highway driving. He put a preluber in the car 10 years ago. He runs 10-30 in the winter and 10-40 in the summer Quakerstate.If the body doesn't rot out first it will go 500,000 miles. This motor does not see more than 3500 rpm. The harder you beat on a motor the short the life span. Cast piston 30 years old where better in metal than the stuff we buy today. The machining with cnc is better but that old machist 40 years ago had more pride in his job and better materials to work with. I will keep my pan loose to check for this pressure damage, next year I am going with a 484 kit with chevy rods. Wider bearings, more choises to pick from. The power game is changing from long stroke or square motors to short stroke large bore and 9000 rpm. With my blower I am happy where I am. Have a good one Rick Lake