671 huffer on a 347 - balancer/crank pulleys

I know this has probably been covered before but I couldn't find anything. I tried asking in the power adder dept but no help. Basically I have a longblock 347 built by Coast High Performance for blower use. Low compression, forged everything and a blower grind roller valvetrain - I'll spare you the details. I'm looking to run a Blower Shop 671 with a 8.5" snout and am 90% assembled except for the crank pulley. I don't want to run a blower hub and have had no luck finding an adapter to go from (28oz imbalance) Ford balancer 3-4 bolt pattern to the universal blower 6-bolt pulley. Does anyone know how to make this work (with 2 v-grooves)? My aftermarket search has come up with nothing. Any info on this would be great!

I appreciate you guys helping me out. It's a sportsman block with a DSS main girdle. When I spoke with BDS before the guy couldn't even tell me if it (the small ford hub)was 50oz or 28oz - must've gotten the wrong guy. I was then told that I would need to disassemble the longblock and have the crank balanced with the flex plate and hub - so I figured a balancer with adapter would be easier. I'll check out BDS again and ask for Craig. Also, blown65, what distributer and cap did you go with. I have about 5.75" of clearance between the block and the blower? If not MSD, is it compatable?