Actually with a .020 overbore, that gives you some room to bore to a set of .030 pistons. With the '049' or any open chamber heads for that matter you'll have to run a dome piston to get decent compression out of it. Not sure on the other piston manufacturers, but I know the smallest oversize dome piston that TRW makes is .030 over.
But the nice thing about the open chamber heads is you get less valve shrouding when you go to bigger valves.
I sent you my number...gimme a call.