Hey Semper, good luck with the build!!
S476 with cover is cool, may i suggest you have somebody build it for you? IMO - stock chargers kinda suck. 8-900 on the street, respectfully, is kinda silly
. I know we all want more more more... but we can't hook it up unless over 80 mph or in 4 hi. The 474-476 with a rough tune will beat most cars driving on the edge of the charger, after that you have to avoid curbs.... the truck becomes a "point and shoot".
Talk to Guy about the cam, i would do it again. Charger comes on much harder and earlier with it, don't need to tickle it with N2O using a 1057 converter.
I would not do heads and spend money on headers/uppipes and a good ped, i see better results from a stronger exhaust pulse/less drive pressure. As for the Cali smog - I live in San Marcos, CA no issue here.