Holley TBI

I have some Holley Tbi throttle body's and some holley fuel controller boxes, one of the boxes is made by msd the other is made by icci.
Both throttle bodys are the same, both have a number on them that is 34r-11109B.
My father acquired this stuff years ago, i remember he ran it on a 440 in a 73 dodge power wagon truck, then later on he put it on a 300hp crate 360 magnum. From what i can remember when the system was working, it worked very well, but i do remember him having some issues with it. What i couldn't say because this was back when i was younger, but i remember he going back and forth from a carburetor to this holley fuel injection.
Can anyone tell me anything more about this set up? Is it a good system? How much are they worth?