Just curious if you pulled the PHS on this bird. In one of your pics, it looks like there's a ram air pull knob to the lower right of the steering wheel. Could be something added later, but might be worth checking.
I have not run the PHS on the car as of yet, but I do know it was a factory 350 car. The car did have several RA motors in it during it's time as a racer though, the first being a RA IV which was done while being campaigned by the dealership, so I can imagine they would have done all of the stuff to make it factory appearing. It ended with a RA V motor (which is still owned by the P.O. along with ANOTHER RA-V) and they was stripped down to re-paint and forgotten.
I do want to do the PHS soon but right now I'm more worried with getting the parts I need to get it off that trailer and back on to 4 tires of it's own.
Speaking of parts needed to roll it around. The Chevy 10 bolt from that 1970 Nova turned out to be a 1978 Monte Carlo with a 10 bolt, so that was a bust. BUT I was cruising the Facebook Forum and found someone gracious enough to give me a BOP 10 out of a 1968 Bird that needs some work. This will probably wind up being the final rear for the car for a while so I'm going to rebuild it with some better gears (3:55 and a limited slip most likely) and call it a day.
I did find a local supplier of restoration parts called Yesterday's Muscle Cars/New York Resto Mod in Farmingdale that has a good supply of parts on hand, so if you're in the area give them a shout!