Please don't add IOS to a 1979 Colt. Please.
The reason not to is because it's like adding a wing to a classic car.I know you didn’t mention iOS but I don’t see a reason not to add it. If it’s a birth year gun, you will likely hold onto it for quite awhile. You can run irons now, but once your eyes start going on you (or you decide to experiment) - it’ll be nice to have that option.