To stroke or not to stroke......
MP. sells a crank with the 3.58" stroke and 340 main for $400. You need to use a .070" over 360 piston for a .030" 340 block. If your gonna have to bore your 340 block to .060" you would need a .100 over 360 piston. But now your going to need custom pistons and a 4" stroker crank is the same price as the 3.58" crank and Im sure most piston companies will stock a .060" piston for the 4" stroke.