You wouldnt need an anti stab kit... you can run standard drivers on that track from a Dragon RMK/Assault.
the 146 should fit and you should have enough adjustment... If not, running an offset axle and/or 8" idlers
I dont recall how many rows of paddles a 2.52" pitch (your switchback) has on the track and how many a comp track has...
The stock switch runs a 9 tooth driver I believe... the Dragons/Assault RMK's run 8 tooth.