I run an 825 Demon Race carb on top of my Whipple. Yes it does use Holley jets, etc. I love it and it has worked flawlessly for two seasons now. Personally, I wonder if there is much difference between an 830 and an 850? I bought the Demon mostly because they build it at the factory to specifically be used in a blower application. It has totally different metering blocks and air bleeds from a regular carb. It saved me time from having to mess with it. I got baseline info from Whipple and tested mixture for 3 hours and it was dialed in.