800 HO parts or swap in a rzr??

All new guys always start out with a stupid question ,Right?
I’ve been rooting thru yer drawers the last few days and this seems like a good forum with knowledgeable people.
Since the 800’s are not HO, Has anybody tried putting in some of the guts-ie, cam,heads,valves, injectors, to make it an 800HO, just to get a lil more out of it.??
There’s couple 800rzr’s in my area with low hours and was wondering.
I’ve had handlebars most of my life, maybe it’s about time I got a steering wheel. Thanks