Re: 64 9.5 fuel pump
The pictures I found of the older style and newer style look like they should work. I'd pull the one off your buddy's motor and compare where it mounts to the engine. Thats the important part, since thats where it gets its vacuum pulse from, but I found a few pumps of the old style with the same gasket as the newer style one so you should be all set.
As I said though, I'd double check the pump on your buddy's to yours and make sure it will work before you pay anything for it.