The bracket is spot welded on at 3 points, so removal would be easy-ish. Making it look excellent is a labor that is user dependent for it's ease.
The vacuum amplifier surplied vacuum to a few things. The heater selector inside the cabin was one of them.
Not for the EGR valve. The EGR valve, IIRC, should be on the carb itself. IF your going to run an intake with a EGR valve on it, you can simple run the unit with no vacuum line. It will stay closed with no vacuum to it. It's only open at cruise/idle and some pat throttle.
The OSCA valve on the firewall? Was connected to the carb and then to the distributor. It's function was a 15 second delay on the distributors operation. IDK about the later years.
I do not have any current diagrams of the system handy for the later years.
These are greasy covers and will need to be tanked, blasted and painted by the way. But for $5 and shipping, I figured it could be a project and maybe something that'll make it to your car. Who knows?