Welcome to the site wturner.
Good to see you are thinking outside the box. Those are two cars you don't see very often as there weren't as many made as the Ford's and Chevy's.
There are several ways to go about finding the car you want. You can check out the Classifieds on this site and place a free wanted ad in them. Check out the local newspaper classifieds, craig's list, auto trader. Check out the national auto traders, Ebay, Hemming's Motor news (most of these publications have on line sites as well). Tell everyone you know that you are looking for an old car and those vehicles specifically. You may go on some wild chases that end up with nothing even close to what you are looking for but the seller of the vehicle you don't want may someone who has what you are looking for. I think the search for and finally the find of an old car that you really want is one of the parts of the old car hobby. Good luck finding those projects and let us know when you do.
To get the most out of the site check out the Knowledge Base and use the search function for quick answers to your questions. As well check out the Project Journals for info and inspiration. Glad to have you here and enjoy the site.