The tires that I have always recommended to use are the modern slicks from any of the Revell T/F or F/C kits. They fill the wheelwells perfectly, IMHO, and the kit rear wheels still fit inside them. Some of the Comp Resins tires that are sold through Slixx would most likely be too large as they better represent the most modern era rear slicks for T/F, F/C, Pro Mod, etc.
Here are a couple of examples of what I've used.