300/440/550 js440 questions upgrades/coversion

So I have a 1984 js440
I was wondering what are some cheap upgrades or mods to do the the ski that are easy to do.
I know people say trade it and get a bigger one but I paid 100 dollars for this ski and it ran so I would like to keep it.
What are decent mods or upgrades to do that are easy to find.
I dont care about going faster on top speed just want more for jumping and plaining

my other question is if I happen to put a 550 top end in this for the extra power what else would i have to change? example like do I need to change the pump assembly or carb etc
 
Location
Stockton
I have a pipe, manifold and intake for $150 plus shipping and PayPal..
West coast exhaust and ocean pro intake
 

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