340 Is done for
Apparently you can get 360's pretty cheap and build them up to nice motors, so you might as well put the 340 aside and spend the money on something you can actually enjoy and not worry about destroying. I'd support that!
My '65 Barracuda Formula S is missing the original 273 Commando motor and although I've found a couple for sale that would be techically correct for my car, I can't see spending the money when I'd rather have a mean 340 under the hood? So I found a 1970 340 in need of rebuild and I'm gathering parts for it and will stick my money into that, to hell with the numbers matching thing.