We built a car very similar to yours
@smkshw for one of our customers, the blower was the same afterthought as yours too. After dynoning the car with the stock
Vortech pulleys it just made too much power, even with a uber safe a/f and super conservative timing. We were able to have Vortech send us a larger pulley (we bought it of course) and had them uphold the 3 year warranty even with the pulley swap. We installed a new tamper evident bolt cap and documented the swap for their records. FWIW, we are a top tier Vortech Dealer which allowed us to do this with their blessing. Long story short, on 6 lbs of boost the car still made 500rwhp+ through our loaded chassis dyno and the pulley swap made longevity a safer bet than leaving the stock pulley as is.