The left wheel that was partially filled in was typical for the time. The tire were so small that they didn't always trip the finish line lights. So they added the extra metal. Also many had the front wheels offset. The left was further forward than the right. I heard Replicas & Miniatures was going to re-release theirs later this year.
Sam I would recommend the Tamiya and Testors Lacquers in the can. They both spray well from the cans and dry fast which most enamels don't. Tamiya primer in white & gray is great to. You can get these at Hooby Lobby and Hobby Town stores. One master those you can look at getting an air brush. That opens up buying automotive grade factory colors from Scale Finishes, MCW, Gravity Colors ETC.
I love Spaz-Stick Mirror Chrome. I shoot it at 15lbs from my airbrush over Tamiya Gloss Black Lacquer. While it is more durable than Alclad chrome it still needs to be handled carefully. Your right it was designed for the inside of lexan bodies but works great for chrome on our models.