as above sell the 340 pistons, buy the right 360 pistons. too expensive you say? don't forget shimming the head off the block will need to buy longer custom pushrods and the intake will need shimming too. doesn't make the difference between selling your pistons and buying 360 ones seem so bad now does it. no shims to buy, for heads or intake and no custom pushrods to buy. and you can still be happy you didn't give money to a machine shop :rolleyes:
