273 Commando Rebuild Or Not?

It depends on what you want. I would reseal it, change out the valve seals, and run it. The compression numbers aren't that bad and fairly even. It will probably get better with some miles. It may last for years the way it is.

I'll second this, but add use the Fel-Pro Viton positive valve seals, Replace the valve springs with 340 valve springs, brass freeze plugs, and a double roller timing set. Re-torque the head bolts, do not replace the head gaskets. If you take the heads off replace the exhaust valves with stainless steel ones.