Converting is easy. Edelbrock makes conversion parts so it's even easier. The stock filter is fine to run on high PSI and higher volume but I don't know exact numbers. The filters shown in Bens link will out perform the stock filter but do cost more, and if it isn't a cleanable filter and gets dirty faster then the stock filter it might not be worth it. A stock filter is only like $15USD.
My $.02USD!! I'll look for some numbers tomorrow when I get to the shop.
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