I did that conversion on my GS 44. There's an outfit called RigRite http://www.rigrite.com/Travellers/NF...Ftraveler.html
that sells the Nicro Fico tracks, cars and block sets. My track is the 37mm X track, which is probably what yours is, too. RigRite sells double cheek block kits so that you could have a proper traveller with 4:1 purchase
that will mate to the existing track.
You don't want to change the track if it can be avoided. There should be a substantial backing plate under the track, that you would have to drop your liner to get to. You do not want to drop the liner if it can be avoided, as it runs to the outer hull
and then the settees and other components were put in afterward. It would quickly turn into a big project
PS: I had forgotten to grab you the manual off of the boat and the wiring
diagram. Will try to grab it next time out to the boat.