If your pistons are .019 out the deck you do not want to run any less than .054 thick head gaskets unless you are positive the open chamber will let the piston in the open chamber area. If they are closed chamber you definately can not run less but that would be good as you will then have nice quench area/distance. In that case you could mill the heads down more to get more compression, all the way down till almost in the valve seat.