Need help with pulleys for V-2 SQ, afraid of overspinning the blower

I'm currently seeing 5# of boost with the Vortech stock pulleys (3.33/6.87). I would like to get 10-12# of boost. I have lying around a 2.95 pulley but I'm afraid I'll overspin the blower in the 1/4 mile. Vortech states that the maximum impeller speed is 50,000 rpm's and at the end of the 1/4 mile the supercharger would be spinning at 52,817.49 rpm's. If I go with the 3.12/7 the impeller speed would be around 50884.62. Should I keep the 2.95/6.87 or go with a 3.12/7? Where can I get the 3.12/7?

hmm vortech suggested that pulley set up for my car and never mentioned a word about over spinning it. Id say with a 8" crank and 2.95 youd be closer to over spinning it. Id like to hear what others ahve to say as well on this

No issues as you really won't even be over spinning it as the serp will have belt slip.

I have spun my T ~65,000 rpm's or 10,000 over on a serp setup.

Main issue is ineffeciency. If you have cogs on it then you really don't want to go over.

You will be fine.