Yep...Gut the baffles out of the airbox. Remove the wiring plug covers...vinyl or some other fabric. Think there is 1 or 2. (on the 2012 there was) They just trap snow/water in there and cause some issues with the wiring plugs in water...
there is a bunch of info on HCS for big block installs.....
A few things to do-motor plate,notch bulkhead for oil injection,move clutch cover,carb boots,new clutching,custom pipe,u cooler,re gear,tunnel extension,new rear drop brackets,holes in the running boards and traction are a must! Scrap...
i used a stock airbox that i had to modify a bit....the air tube draws from the side panel. On big powder days (which is almost every day) it plugs up. I have the intake pc half on the side panel screen and half drawing hot under the hood air.
guess it depends on what riding u do...
If no trail riding i would pull off the sway bar and all the extra bogie wheels for starters.
Punch your track and run drivers.
cheers