Stay away from BDS Call Littlefield blowers at 714-992-9292 and ask them about which intake manifold to use on your motor for a 8:71 or even a 10:71 The bigger the blower the slower you will need to turn it to make the same amount of boost, slower turns equals less intake manifold air temps
On your deal if you want it for looks mainly and don't really care to have much more than 7 lbs of boost(probally around 600 HP on 91 octane pump swill at 6000 RPM ) then go with the big bore 6:71 case