Well, if its Super 8 ... pardon my inexperience with them cuz I am almost 22 years old
... cant the film be taken to say a photo place, and they take the negatives and turn them into pictures?
If u had a projector then u can set up a miniDV camera under the projector and film it. I am 100% sure there were no such thing as FireWire ports on projectors 40+ years ago
I am pretty sure it will be expensive if u take it to have it professionally done. Thats the only thing i can think of without the possibility of damaging the movie.