identifying heads for 273

Lot of good info here. The engine is completely apart, the crank has been polished, it has .030 on the block and .030 domed pistons (previous rebuild, I did not know it had been rebuilt or i would have just run it) I want to build it to last and have a bit of spunk. I am trying to go on the advice of the machine shop that the 10.5:1 will be problematic. I am trying to get a good rebuild for this commando 273.