What you got for pipes on that ole girl I have a 1990 identical to that mines got AAEN TRIPLE pipes. Mines also a 121 not a sks looks like it's had a few things changed seat looks to be an xlt or ultra with a a 10.7 gallon tank as appose to the 7.5 gallon tank and short seat.
When I was a kid it was the Wildcat vs this Indy. Tuned correctly the Indy would take it from what I saw. I saw a Wildcat 650 blow a plug right through the hood.