Comet Clutches

I race vintage snowmobiles and am wondering what the best clutch would
be. The guys that run Comet clutches in my group seem to do the best.
They all have 94c models. What are the differences between 94c, 102c,
and 108c, and which one would best serve me? Thanks!

here is the skinny.the 94 is called the duster clutch not all that
efficient but adequate,the 102 and 108 are the same clutch exactly
other that one has a larger diameter by about3/8 of an inch,that
gives you your 13% overdrive the 102 is probably the one for you
easy to tune,long lasting,and parts for them are cheap to buy,the
fly weights and springs from polaris and cat can be used in them as
well which makes them pretty universal,buy the 102 you will not be
sorry,your machine will probably a 100cc bigger if you get your
spring/fly weight combimation dialed,also comet will have a
spring/flyweight configuration on file for your machine