It can all be converted but it depends what your getting and what you have to convert, that will tell you if it's worth it.
You can call ATI and tell them what you want to buy, and what you want to install it on, they can tell you exactly what you need and how much.
ATI ProCharger, Phone: (913) 338-2886
I once bought a used Procharger P1SC for a 04 4.6 4V and I put it on a 96 4.6 2V, but there was a lot I couldn't use. I got it at a killer price and it came with (2) MAF's, Fuel Pump, Injectors, Intercooler, bypass set up and all the piping for that, and a boat load of tubing and connectors. In my case it was worth it because I ended up finding a used Plate and then I used my Stock Lightning 90MM MAF, Stock Lighting 42lb Injectors, I sold the Cobra TB Pipe, Crossover, Inj's, (2) Maf's, and simply had to pick up some Bolts, Nuts, Belt, and a bunch of Rubber Fittings to make it all work.
It wasnt the nicest install in the world but I did it by myself one Sat and was driving it that night and the results were amazing.
I just sold a perfect PROCHARGER used plate to someone on the forum for like $50.00 to help a Brother out but it was for 2004 4V so it woudnt work for you.
This is the current set up I have on my Mach 1, much cleaner install