[Firebirdjones]

I tune carbs and newer LSx fuel injection stuff, but the throttle body stuff is an older design that uses a computer chip and completely different software.
I used to tune tuned port injection stuff which used that software made or sold by Moates, of which I no longer have.
At the very least you would have to find a place that can reflash your E-prom so it's more suited for the fuel and timing requirements of the 383. Other than that, in a nutshell what you have should transfer over and work.
TPIS is one place that comes to mind. Arizona Speed is another. They both still tinker with E-prom style computers as well as design and build intake and fuel systems for this style fuel injection.