There are two problems with that conversion/deconversion
1- Super Off-Road has a security chip, which is replaced when doing the Trak Pack conversion,
so you can not do a simple eprom swap, you also need the correct security chip.
I don't know if the security chip has been cracked, but I haven't figured out how
(...which I'd love to do because I get alot of requests for the Trak Pack upgrade.)
2- The other issue is cost . The conversion requires about 28 eproms.
Given the increasing cost of blank eproms, and the work involved of programming
that many chips ( ~ 3hrs ) , you could buy a working boardset for much less.
In fact, my recommendation to you is to look for a non-working boardset
and poach the eproms and security chip.
Good luck.
Steph
www.Hobbyroms.com