I recommend cam 12-772-8 for your setup. The cam has an rpm range of 3000-7000 and will make peak power at 6800. The cam has duration @ .050 of 248 254 with valve lift of .576 .582. You will need a small base circle with the standard cam location. It will be no additional charge. How does this cam sound?
from Ryan Heart?
I think this cam is a little small to make big power though on a 383 it should rev 6800.
I would use AFR 210s or bigger to make 550 HP.The SCR will need to be tailored to fit the heads when you decide,probably 10.5 ish:1,depending on cam chosen.
the cam you mentioned has an ICL of 106º.
you will need roller rockers with girdle or better. decent headers/manifold and fuel management system