I picked up my Superbird from the restoration shop today.
Yes I took a couple of liberties that might cause the “purists” to have a stroke. I have headers, 2.5″ exhaust, and the motor has a stroker crank bringing the CID to 500. I also have a heavy duty clutch and an aluminum radiator.
I decided to do all of this about 8 years ago as I was going to drive the car. Everything can easily be bought back to bone stock if the next person to own the car was to do so.