~450hp from stock stroke 340?

Trick Flow heads are known to support 550+ hp and if built right should be able to support 600+ hp (2hp per cfm), what's so terrible about the OP's build that it's gonna fall majorly short of a moderate asking of 450 hp (1.5 hp per cfm) a 100-150 hp under the heads capability and seemly even hard pressed to do 400 hp (1.33hp per cfm) ?

Asking 450 hp out of TF's is like asking 300 hp out of 1.88 J heads.