Use a table ban saw to hack off the 340 piston crown .

You scared me with the .135" figure. Maybe I need the forged 3.79" crank. Price difference is bout $200. The way I figure, that leaves about .67" that needs to be dealt with. I am figuring just mill that goofy ring that's on top of the stock piston then use the appropriate gasket to put me home at tdc flush with the deck or "close" hallelujah.