I recommend Building and Detailing Scale Model Cars by Pat Covert. Pat Covert used to write articles for "Scale Auto Enthusiast". It's out of print but you may be able to find one on eBay.
Nice job on the rebuild. Those mag wheels look nice with wide white walls. I never would have considered that combo. I built that same kit in 1993 when I first started building model car kits and it is due for a rebuild.