~450hp from stock stroke 340?

340, 10ish :1, cleaned up eddies 270cfm, XS282 comp, victor, 750DP, tti's 450ish hp

Car ran 116-117 in garbage air and poor tune in Las Vegas at about 3200#

Biggest difference is the cam, XS is light on lift, more duration at .050 than the OP's cam plus solid vs HR.