Welcome to the site. I would highly recommend trying to do a search for yt175 as there is tons of info on here. Info on stock and modded as well. There are a couple yt175 with aftermarket rear suspension kits on them as well as modded to take other topends with better porting and such and also manual clutch mod info as well. Use the term "pro tec" to help with your search. I even modded a set of ytm200 triple trees to fit on the yt175 to have a little more suspension travel to go along with my pro tec rear suspension kit.
Sorry, I don't know if those carbs will switch or not. Yt175 carbs aren't too hard to find for rebuilding. You could always use a carb off a yamaha 175 2 stroke dirt bike, like the mx175 or the it175 or the dt175. Those dirtbike carbs have the advantage of the choke being only on the carb and not needing a long choke cable as well.
Nicholson 500x (Project)
Nicholson 185s
Nicholson 110 (That takes an atc70 tank)
Ascott 500 head/350x (Project)
Homebuilt Racer Chromoly Suspension 110 (Ragin Runt)
PK Racing Suspension 70
A+ Inc Suspension 70
AWS Aluminum 90 frame
Hi Performance ATC Suspension frame rd350
Hi Performance ATC Suspension frame 90