If you are arriving Friday, make sure to get there early enough to get a nice spot downtown, as close to Lola's restaurant on Lake street as possible, to see all of the race cars roll into town. They close off the streets at about 5 and the cars show up shortly thereafter, at least by 6. Many of the Can Am cars including the T70s will be going downtown (20+).
Getting around Road America is not easy as it is a big place. If I see a person in a golf cart and I want a ride, I just ask. Most of the T70s will be in the main paddock approximately adjacent to the start finish line. Can Am cars similarly. The T70s are for the most part genuine, as a serial number was given for most of the cars, but that does not mean a whole lot. The emphasis on this event is the racing and not a show or parade. No replicas were entered as far as I know, but they could have been allowed under the rules so long as they were built correctly and the driver had the proper credentials. The racing will be very competitive.
Hope this answers your questions and maybe we will see you there.