Well i don't know the hp of it' but it ran 12.4 111mph in my LH in full steet trim but it had MT slicks but that was in the early 90s there was alot more in it we gave up with it as we bought a house.
We did run a 10.7 with it in my capri in 2002. The BM set up was sold to operation drag safe and is now on there motor in the red gemini and they have 400HP. But these blowers can only move so much air so they have a HP limit, that's why we now have a 8/71 to suit VN heads and this might be sold soon as i have had it with 308s.
Now looking at a steel crank for it. For the cost of one we can build BBC.
More you spend the faster you will go