The grill I have from a 64 is aluminum. That's not to say the one you have is not chrome, time to get out the magnet.
The links Mark provided are good. I looked at the Rod & Custom article and it is good but it glosses over the polishing. I've polished a few pieces of aluminum and it takes time and patience, not to mention some good wheels. The second link has some good information on keeping it looking good.
A stainless steel grill would be something to have, if it exist.
Larry
