small block 671 blower ?
Rob, I didn't need an offset distributor as I used the Aussie Max Wedge Performance intake manifold. I do however have an "offset" 8-71 blower. That means the extra blower case length(1" greater than a 6-71) is towards the front off the engine, instead of the rear.
The offset distributor is an Indy Cylinder piece, costing $795..... If Indy put a little thought into their ModMan supercharger plate, there would be no need for the offset distributor. These are pics from Indy's website..