Well, medium palomino is one of the colors you can't get, so this is how you'd have had to do it anyway. Get the conversion spray and medium palomino spray and make the black one right for your car. Cleaning of the repro is the most critical step, I use a detergent, then a degreaser, then a solvent paint cleaner, all scrubbed with a Scotch-brite pad. Then the conversion spray, finally the interior color. Set the pad on a piece of plywood so you can spray it all at once, instead of having to flip it over.
Don't do black, the palomino interior is rare and special.