do you think you could try it with a 750 CFM carb
Something is limiting it I rember hotrod did one with the same heads same intake and the cam was only slightly meaner then mine and it had 350Hp and 420 pounds of torque for mine to be down nearly 50 pounds of torque and it being at a higher rpm is scarey
There will be differences between programs as well, so find out exactly which program and version is being used. You can expect a 10% deviation from what the program shows, usually minus because the programs don't take climate and elevation into account, but I have seen a couple combos that came out up to 5% above the estimate. The important thing to remember is dyno programs are just estimates based on known performance parameters. They can't take everything into account.
Desktop Dyno 2000
I don't know what the heads specified flow at, so I chose "wedge, pocket porting" with the valve sizes provided.
cam had duration specified, 108 degree lobe center, "auto select" valve lift. as$uming "large tube headers with mufflers" for exhaust. Regardless, here's my specs.