Need Help With Jetting

I bought a 1994 husqvarna wxe250 without exhaust chamber or silencer. I redid topend and bike started from first kick. Couldn't find stock exhaust chamber so bought a Procircuit chamber off a 2000 husqvarna cr250 and after little work got it to fit perfectly. Bike got way harder to start and won't keep running without throttle and smokes alot probably due to mix ratio 32.1. I'm not familiar with jetting and not sure which size I will need. Currently have 370 main and 35 pilot.

I would start with what the OEM called out.
32:1 properly jetted will be fine and is a good ratio. But again I would baseline to OEM everything. This does include the carb itself, needles wear, slides wear etc. freshen everything. You need to baseline the machine.

Again baseline- dig around on the internet for parts manual or owners manual for OEM jetting specs. Clean your carb (again, pilot may have debris) , verify reeds (big cause for bad idle), verify your PV linkage is correct, fresh plug fresh fuel 32:1 is fine, once all the fuel stuff appears good verify spark, check all connections etc etc etc basic troubleshooting step by step

this may give some info the engine is fairly unchanged throughout its life cycle
http://www.cafehusky.com/threads/250-300-360-jetting-database.8881/