I get all of that but that low of HP?? I think it should be darn close to 500lb ft. I asked the shop about porting the intake and they didn’t recommend it which also seemed odd to me. I know Edelbrock isn’t known for Optimim HP but again I think it should of at least made 1hp per cube…
What kind of valve train are you running. Hp seems really low to me. I had a 408 stroker built and it dynoed at 525 hp and 522 ' lbs of torque. You should be at a minimum of 450 to 550 hp.
Good luck on your build