I thought my 331 with AFR heads and an X-cam with a full exhaust and intake and s/c with 6 psi would pull down more that 389rwhp and 403rwtq. But i'm still happy with it. Its a safe tune and will give me years of fun! But i heard that i shouldn't expect more than that. I had guess my numbers higher cause of that of other cars but then the guy who tuned mine said that alot of guys BS their dyno numbers. Kinda like my fish is bigger than your fish deal! Now i don't feel bad cause either you or the dyno is lying!
I don't wanna sound like i'm bashing but that's kinda weak for a blown stroker. My buddy's 347 put out identical numbers all motor (and i don't think 16ci is going to make that big of a difference..lol). But like you said it'll be hella fun and safe for a good long time.