O.K., reading in between the lines, here's my opinion.
A 6-71 is gonna be cheaper to buy than a 8-71 and will allow more room at the distributor.
You don't need lots of power, so keep boost down around 4-6 pounds and heating the intake air won't be much of an issue. A large bore 6-71 will make 4 lbs on your motor at 1:1 and 6 lbs at 5% overdriven.
Starting with 8.0:1 static c.r., 4 lbs will result in a c.r. of 10.2:1 and 6 lbs will result in a c.r. of 11.2:1. Either of these will support pump gas if you build the motor with a good, tight squish of around 0.035" to 0.040".
I'd choose a cam with an operating range of 2,000-6,000 ground on a 110 LDA and use a converter with a stall range of 1,800-2,200 rpm's.
At 6,000 rpm's with 6 lbs of boost, you'll need 1109 cfm.
The formula is CID times rpm's divided by 3456 times boost divided by 14.7 plus 1.
(454 times 6,000 divided by 3456) X (6 divided by 14.7 plus 1)
(788.19) X (1.408)
1109.77
Here are a couple of links to help you figure it out.....
http://www.blowerdriveservice.com/faq.php
http://www.blowerdriveservice.com/recommend.php
And a paper I compiled on superchargers.....
http://www.streetmachinesoftablerock...topic.php?t=81