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Make sure the carbs are spotlessly clean since jets are small and plug easy. Carb boots between carb and motor can crack causing a lean burndown. Also clean white powder out of inside of these boots whete they clamp on flanges. This is corrosion and can suck air in. Check condition of fan belt too.
I think a 3 inch rise is the max without extending cables etc.
A 440 should drop right in using its own mount plate. The 440 used a tra clutch while the 380 used the bombardier lite clutch.
You are best to stick with the 380 exhaust system as it is tuned for this motor. Use anything else and you will probably lose power. Good luck!
 

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If you use the 440 motor plate clutches should line up good. I think 380 and 440 airboxes are the same. 440 exhaust is ddifferent than 380 but might be the same as 503 used in formula sl and touring sle and skandic 500. Exhaust should drop right in.
 
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