The Grosse Jets won't give you any better performance - maybe just more reliability. I've always had good luck with, and stuck with the stock jets.
As far as needles, there are different tapers that you can get. If you are pumping a lot more horse power, you need to feed the engine better. Try contacting Jeff Winter at Rallye/Sport in Colorado. He has modified needles for racing and knows a ton about these motors and carbs. He will be able to give you some great information.
Jeff Winter
303-427-0510 (MST)
7102 Raleigh St. #3
Westminster, CO 80030
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