Ok, So I'm down to ordering my cam which I've chosen the Comp 68-231-4 and with my settings that gives me a 9.31 SCR and 8.15 DCR. I'm thinking this should let me run on pump gas?

In the calculator it lists the cam timing as advanced 4 degrees. What's the best way to set this, with offset keys or with a multiple keyway sprocket or does it matter? Also the Comp cam data lists the Intake opening as 4 degrees advanced is the 4 degree advance that's in the calculator built into the cam or are we advancing the cam timing 8 degrees?

From the board I've gleaned that I need to come up with a set of Mopar valve springs and I was wondering where the best place to get them is?
Thanks
Dean