340 pistons in a 360?

The Compression Height of a 340 piston won't work with a 360 crank. The piston would be sticking way out of the top of the block.
Yes and no.
It really falls into the " why the hell would you " file , but a shorter rod would certainly work.
Different rod big end width and pin bore aside , there is nothing that can't be done if your dedicated or foolish enough. LOL