John,
I remember this generation of Rodgers instruments - which included the 330 and 990 as well. They were very well-built, including nice wooden keyboards. Unless yours has been updated, it does not have MIDI. Rodgers might have an upgrade kit - so its worth checking with them. If not, you will need to add all of this, as well as remove the multiple doors full of analog electronics to make room for what you will need to add. The existing power supply might be fine. In my own conversion, I replaced the incandescent lighting in the music rack with solid state lights. The old bulbs are hard to find nowadays (bit still possible online.) The pedalboard is excellent - and can be adjusted for touch. The pistons and toe studs should also still be excellent. I believe this model had the core memory capture system - with real magnetic cores! These will not be worth saving - unless you can donate them to a museum or give them to friend who collects historic computer systems.
Les