Hello Ed,
You are close guessing where I live. I am surprised that you even know where Garrison is! Garrison is further west right on the Utah Nevada border. I am 85 miles east just off hi-way 6-50 (famous as the "Loneliest Hi-way in the US"). I am trolling to see if I can find a 302 or maybe a 270. At this point I am going to build with what I have and update the engine later. I have considered an NV-4500, but will try to stay with the original 4 speed if I can.
Alan