I am going to install a Comp Xtreme cam in my bone stock 318 this Winter. The cam is a .462/.470 lift. I'd like to pick up valve springs at the Nats if I see a good opportunity. What size springs should I be looking for? What brand would be good?

‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500