Ram Jet 350, cam and head swap????? MEFI 4A can't be programmed

[64malibu]

I've just recieved my new GMPP ram jet 350 just to find out that the MEFI 4A controller is not programable and that a cam & head swap is out of the question, however I did find a MEFI 4B controller at "MSD Fuel injection" and also at AZ Speed and Marine. Apparently these two are programable with common laptop and supplied software. Has anyone had to deal with this problem???, If so how difficult was it and which unit do you think I should purchase.