Thanks for the replies.
I wondered if the SM465 that I have might have had a "custom" paint job done on it.
Since I will be using my truck for sled pull competitions, I will be required to replace my factory bellhousing with an SFI approved one. ($$$

)
I will probably go back with black on the gear boxes, since rust is not appealing. If it were a true factory restoration I may do the natural metal deal, but it is a custom job, so some level of detail is in order. The red oxide could be a possibilty. Hmmm....... That would be different......
I have been considering painting my 454 GM corporate blue, just because everyone seems to go with Chevrolet orange.......I have to be different, but I still want a factory color.

I just hope no one confuses it with Furd blue.....Talk about a hideous truck fashion faux-pas.