Derek, the column and the dash are blue. I replaced the original dash with a reproduction one but the original one was blue also. I'm not sure what the correct color is for the steering column to be honest. Someone could have painted mine but like you said, a 300 Deluxe is a odd duck.
I do know of a documented black SS396 300 Deluxe Post Sedan that is for sale but it's in the $50k range.
Dan Vasic got twelve '69 Chevelles together at the MCACN Show. Here is a link if you want to check them out. The black post car one is the one for sale.
http://www.yenko.net/ubbthreads/ubbt...=438171&page=3