Variable speed wiper motor 69 Barracuda help

Okay, here is another question.
Has anyone tried using a 73 up variable/3 speed motor in there 72 down A -Body with the 69 switch?

I would be willing to go with the later model motors if it will work with my switch and wiring. If anyone has done this, please let me know what you had to do.

Thanks,
Eric
69 B5 408 Fastback