I heard the cc306 will run alright with just a set of new valvesprings, stock rockers and lifters and hardened pushrods (which my 94 has). Will a gm 847 work like this or is the lobe profile more aggressive on the 847? Also curious which one idles more radically on a 350? Ive seen dyno's from both and it seems the 847 makes a few more ponies.. Like it says these are just questions for my own curiosity at this point.