clifford or offenhouser intake??

For your turbo build I would use the Offy. I have been led to believe that in FORCED induction that you want shorter runners. I would NOT polish the inside of the runners as you want a certain amount of turbulence to help atomize the fuel. As one of our faster cars found out with our Aussie Speed Hurricane Intakes.
Since I dont run a Turbo this is all basis on information I have gleaned from others that I know and respect. I WILL have first hand knowledge on Roots type Super Chargers soon. I will have multiple intakes to test on my mule engine.
Frank