Should I bore a 74 318 to 340 ci or just go with a 360?

................Alrighty...........i speak from experiance about boring 318s out to 340 size.........yes it can and has been done............u need to get the block sonic tested to check the thickness......i dont believe a 74 block will go that far........i've had 68-9s done...........anything over a .060 overbore will be custom[expensive]pistons...u will be way farther ahead to build a 360, theres all kinds of stuff out there for a 360 build.......kim........