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Hi Andy My 2 cents. The boss block has screw in water jacket plugs the block also has a higher nickel content than the standard 302. There are different pistons in the boss 302 because of the polyangle wedge staggered valves. The intake valves are larger in the 69 heads than the 70 heads. My Shelby motor came with 8 cylinder selves in it, and I have no problems. I know of a couple of engines that have 6 and 7 sleves in the block without a problem. If the sleves are installed correctly their should be no problem unless you are looking for 600 hp and 8000 rpm. Buy the motor. You can always save it for a spare. I have a short block spare with 3 sleves in it. Good Luck. Rick Lake
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