273 Commando Engine Build

I just built a 273 similar to what you describe that you want. I have not put it on the dyno yet because neither me or my buddy with the dyno has had time. I bought a set of .030 over Race Tech custom flat tops that will give me 9.6 compression with 58cc chambers and an .028 head gasket. I used a set of of 302 heads that turned out nice, but if I had it to do over again I would use a new set of Magnum heads from Engine Quest. They flow better right out of the box. They have 1.92 intake valves, which may need the tops of the bores to be notched, but that's no biggie. I'm using a Weiand 8007 intake, which is for the small ports and will be using a Mopar Performance electronic ignition system. Dougs D450 headers with dual exhaust. The hydraulic roller cam is from Bullet Cams and is a fairly mild grind with .447 lift on both sides with 1.5 roller rockers. It has 272 duration. I'm going to run a 4 speed and probably 3.23 gears.