Ummm not to sure about the swap for a SBC but it loooks good. Brett the blower is positive displacement so can be run at any speed depending on capacity of engine & boost requirements. I think most of the drag motors massively over speed the blower to get big boost. 6-71 has been quite common for US V8s over the years.

This looks a lot better

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&_trksid=p4340.m748&item=300517981395&viewitem=&_trkparms=clkid%3D6672636018943962774#v4-40

There is a Vortech V5-G in my garage which would probably suit this which I'd sell for the right offer!

Never been a fan of Vortecs... might as well turbo it in my opinion. You cant beat the look and instant boost of a roots or Lysholm! While Lysholms are more efficient they dont look nearly as good as a roots with a bird catcher

I guess it depends on whether you like the look of 'my car goes ultra fast, don't even bother trying to race me' or the 'my car looks standard but actually will kick your ass any time.' As you might have guessed I prefer the former... though dont go thinking I like baked-bean-can exhausts etc... it has to perform to at least how it looks in my opinion!

By Vortech I assume you mean centrifugal blowers. The problem is that is you have adequate bottom end torque then more just means you break things. So the centrifugal gives turbo like rising boost. The pd blowers are more inefficient as the boost & revs rise, more importantly something big enough to do a decent job doesn't fit under the bonnet. I have a M65 in my garage from a Merc Kompressor & it is enormous!