340 or 408

Why not wait to see whats in your 340 block first? Maybe someone stuck a forged crank in a later block, and maybe had the rotating assembly balanced already and put good pistons in, you could already be sitting on some good stuff. Kinda just depends on what you got and what you want. No doubt the strokers run well but it aint that hard to put a streetable 340 in the 12s, how fast you wanna go?