I misspoke here...
It looks to be an 85 indy 600 se
The problem though is that the chassis is stamped a late 1983 date which leads me to believe it's an 84 production.
When I run the serial it says the model is an 84.
So i'm not sure.
I then saw that the same sled I have, except with a chrome (unpainted) chassis, compared to the black I have was posted here: Polaris Snowmoblie
Any insight would be helpful.