The Truth about 318s
Yeah, I've got a .030 over 360 and its barely 9:1 with some aftermarket pistons. Also got a 5.9 Magnum and the pistons are down .050 on that as well.
I'm spoiled by the Ford stuff. They don't drop the pistons down in the hole like Mopar, so you can actually get some compression and quench without going to the machine shop.
Oh well, if it was easy and cheap, everybody would do it, right? LOL!