Bohnalite 6-71 Blower

Anyone ever heard of a Bohnalite GMC blower???? I aquired what appears to be a rebuilt 6-71 blower. It has a similar case and rotors but the case only uses 4 bolts to bolt to the manifold (Which I have yet to find). I read something on a another forum that said they were made long ago and maybe were used on Chrysler hemis. Any info would be greatly appreciated.

Go here, www.alsblowers.com. You'll find some awesome setups.