Cool, I used to have the Postal version of that scout ('64, I think it was) with the right hand drive that I converted to 4wd.

Is the assembly hollow from speakers to empeg? I mention this because nothing beats the snot out of circuit boards like a speaker near by. I've seen installs like this in vans and such where the stereo didn't live a year. If it's in it's own compartment, you should be fine.