Didn't they run a blueprint 408 on engine masters with stock eddelbrock heads and it wasn't that good? Then they ported the crap out of them and made a ton of power.
Yes Siren. The better curves above are from that engine featured on HRM and Engine Masters. Sure a capable builder can top that and do better with just a 367 or so with some ported heads and about the same cam. :)
But the OP clearly stated that he wants to know what can be had with box stock heads.
