Very nice!! Not sure how I missed this thread, just found it now. Are you set on which wheels and tires you will be using? These looks already perfect size and perfectly fine by the way so no real reason to be changing them, unless you are looking for another look.
If these Tamiya wheels and tires looks this size, it means the model is quite big! So most on-road car tires and wheels I suspect will be way too small (for instance HPI vintage). I guess on-road tires intended for trucks would should provide good options though.