Garret closed last year. Have you been to the Garlits Museum in Florida?

In north east Ohio Doc Snyder in New Springfield and Flynn Auto Group in Columbiana both have large collections of Muscle and race cars. Neither is Mopar specific and both only have a few Mopars. Doc has more race cars than Flynn and Flynn has mostly original Muscle cars. Both are very worth seeing if you will be in the area.
They are only a few miles apart so it's easy to see both in a day. They are both private collections that require appointments to see as they are not located at their businesses. I don't think either of these is advertised or well known. I was shocked when I found out about these less than 45 minutes from where I had lived all my life and had no idea they existed. I no longer live in Ohio and do not have contact info or addresses for either collection but I bet a few members here know.