my 408 build

I am building a similar 408 with unported edelbrock heads. I am using the same cam, Comp recommended it for my combo. The cam is actually a take-out from my 360, and it ran 12.30's at 5800' track altitude. I am running 11.9 compression (static) to make up for the altitude up here, and an air gap with an 850 mech sec. carb. I am hoping for 450 hp to get my 3200# car into the 11's. I will know in a month or so.