Your FTA receiver is a DVB receiver. DVB is a digital signal broadcast mode, like DCII or ATSC, etc.
There is quite a bit of DVB (digital) free to air content on C band. There is a list of FTA channels maintained by board staff linked at the top of the page. It covers C and Ku birds.
Another group of lists, covering a wider range than just the US visible birds is located here -
http://www.global-cm.net/mpeg2central.html
Most FTA receivers are very similar in operation. Depending on what you have, it is likely that someone here on the board has one like yours, you should have no problems getting any model specific help if needed.
I would set the 920 project aside for the moment, and focus on getting the dish to track the arc. There are a number of strong C band DVB channels that you can use as 'beacons' to align the dish. Many of the FTA TPs are not as strong and some are hard to use for alignment purposes. Once you get set properly they do come in fine. W5 @105W does not have any DVB content but 103W has plenty, so you should have no problem guestimating it's position for the DSR.
Program up the FTA box with C band info from the lists and go hunting. Get you a portable tv, extension cord, card table,your FTA and a cooler full of cold ones and go set up camp out by the dish so you can see the results of any adjustments you make in real time. That will be the best way to verify/re-align your dish.
Dont forget that if you have a polarotor style LNB you will need to use the 920 ( or any other C band analog ird if you have one) to switch between H&V and move the dish. If your RF remote works that far it will save running back and forth. You really dont want to wag all that out and set up up too......lol
There are several recent new threads on getting started, some of the questions you will have may already have been addressed, but dont hesitate to ask. Lots of helpful folks on here.
Keep up posted.