Help choose engine for my 68 Barracuda

why not put the 318 crank and rods in the 340 or atleast the crank then get a good set of rods and get the rotating assembly balanced while your at it. prob be the cheapest and easiest with what you have. The 340 360 debate will go on forever but for drag racing give me a 340 big bore short stroke rev to no end lol