I assume with the number on your 500 it is NOt a KR?
I will let you know on the gaskets. If you need them, I may have a set kicking around. Also if you do not want to remove the heads for machine work, you could install a set of composite (not header) gaskets that come in most rebuild kits and are avaialble from NAPA as a stand alone. these typically have a waffle face aluminum side and a side that is gasket material.
Rick
