People make it so difficult. Put some JWT S3's in there with an Apexi gasket and a ROM tune (on top of the 740's you already have). The S3's don't need springs, and flow great. The Apexi gasket is bullet proof. Get some more stock head bolts ($80 a set) and you're done. You don't need step2 cams to make 400whp. You don't need ARPs to make 400. You don't -need- adjustable cam gears at all.

By the way, shattering rockers sucks. I did it and ruined my HKS cams, and bent a valve. This happens with valve float.