Certainly didn't know that '64 is the first year of non-different length sure grip axels.

Can you cut off the studs to get the drum off? Yes.......but its not easy. You still will have the swegded shoulder of the stud if you cut it off flush from the outside. You could go in there with a big drill bit to drill some of the swedge, but that is really a drill press operation and you can't do that on the car. I have removed a number of these studs by cutting the head off and pushing it out from the back, but the drum has to be off for that. And, this is a very good grade of stud, so that isn't easy in any case. You really need to get one of the pullers and do it that way, in the end its the right way, and its the easiest way. Good luck to ya!