For 8mm film the only way is to just simply set up your screen and using a good camera capture it digitally on video. Then you can do whatever you like with it. I know it is time consuming but as it is not digital you’ll have to let each reel play out. VHS is not digital either but at least with VHS players you’ll have line out connections you can put into a computer or some other recording device. I don’t know of any 8mm projectors with modern line out connections. I of course could be wrong and if yours does have modern connections then just follow the procedures for VHS. Also you may be able to get it done commercially.
Thanks for the reply. I am going to look into the cost of having it done. It may be worth it in the long run, especially for his stuff from his F-105 flying days.