The torque and HP peaks look good(1600rpm spread) and with a 4" crank you won't make power over 6000rpm with any conventional head without major work(no mild porting will help),W-2's,W-5',Indys etc are needed as the CSA of any production head is the limiter. The AF is rich which will kill the upper rpm HP and I'd expect good gains with timing and tuning. It will never make great HP numbers as it's very limited by the CSA. But for a street car it should be fun. Funny story for those that give a crap. I built and raced a 408" bracket engine for 8yrs. started with a set of junky home ported J heads,262.625 108lsa roller cam,ran 10.55@126mph best. Decided that a "better"head would help.LOL Swapped a set of Brodix B!-BA's with professional port work. Car slowed down .2 and 2mph. After a year of tuning and parts swapping went back to the junk heads and everything was good. I've seen this many times with Edelbrock heads,slower to no gains over a well ported junk head,despite good quench and yadda,yadda,LOL A little off track but to the OP,dyno numbers are just that.