I have 61 Chevy (super clean) that will be converted to a GMC-dash and all. I have a built dual quad 409 that will go in it. It will be painted to look like a factory GMC v6 and the valve covers will get GMC script on them. It will look like this factory photo when it's done.
http://www.gmphotostore.com/prodinfo.asp?number=53217863