There is exactly ONE source for the specific parts required to adapt this blower to a Pantera, and that's Steve Wilkinson, of Panteras By Wilkinson, (562) 634-3434.
He probably doesn't have any blowers in stock, but may be able to provide the ancilliaries such as the special brackets, jackshafts, pulleys, etc. etc.
This is a very non-trivial conversion. When done right, it can be very impressive. But ultimately it's a very expensive, complicated and maintenance-intensive way to achieve horsepower. The WOW factor is incredibly high, but it's a rather impractical solution when compared to more conventional means if horsepower is the ultimate goal.
Forest Goodhart (eventually) had success with his system, and his car delivers planet-shattering amounts of horsepower and torque (the number 565 rings in my head although that may not be right.) But it took literally years of concerted fiddling, a conversion to fuel injection, lots of dyno time, a few blown head gaskets, etc. etc.
If you want to wow 'em at the street rod meet, this conversion may be right for you. Plan on spending $20-25K before you're done.
Or, you could slam in a stroker 427 Windsor or a 514 inch 460-based motor and get the same level of performance for half that....
Mike