If you are going to run studs I'd say that you need a minimum of 120 in the centre belt.
Depending on the conditions you ride in here are my recommendations.
1 - Get a new track, 1" or 1.25" 6-pitch predator or a 1.25" Ripsaw (track choice is somewhat dependent on riding style, riding conditions, and if you are planning on running studs)
2 - Install a Yamaha torque limiter on the engine and reset the offset to SRX specs
3 - Set the transfer rods for maximum transfer, get hand adjustable nuts or aftermarket rods.
My Viper in stock form sucked!! I installed a fully clipped 1" Predator, Yamaha torque limiter, and Yamaha transfer rod nuts. Sled is night and day difference. Prior to the changes my Vmax-4 walked all over the Viper, now the Viper holds it's own (on packed snow, not on ice, the Vmax-4 has 192 studs).