I think you were very lucky to find such a nice rare car that's NOT all cut up and beat !!!
I would say to stay very close to original , The Dynomax exhaust would be my choice because of the less noise .
As far as the brakes i would also keep the original stuff.
My USPS blue car came with the silver 10 hole wheels so i purchased a 2nd set to paint black ... take a lot at pic, that made a world of dif..
It the end it's your car to do as you wish but remember they are only original 1 time .
ssp91ssp