You & I are in EXACTLY the same boat. I bought a 1973 Barracuda: 318, 904 trans, 8 3/4 rear with A/C, PS, PB, Cruise Control, rallye hood & wheels in a fairly rare color combination and like you I struggled with what to do with the car once I bought it. Everybody has to decide for themselves, but for me it is something special because it has lasted almost 40 years without any significant changes. The reaction I get when I go places has a lot to do with it looking original so for me I'm going to keep it 'looking' as original as I can and only do those things that are not immediately visible. So I've decided to upgrade the suspension with original sway bars, upgrade the 318 to a 4 bbl using a stock 4 bbl air cleaner, etc. and even leave the questionable looking bumper guards that came on it in 1973. Its a fairly highly optioned Barracuda and I've decided to celebrate that and the fact its kept it's originality all these years. That's what I'm doing but like most everyone here will tell you, its your car do what you want to with it.
Later, Jim