Supercharged or Turbo?

depends on the motor

if we are talking slant six that can go to a whole whopping 5k then roots style blower all the way,full boost at idle and effecient to 5k

if its a 360,440,426,413 then you need a centrifical supercharger will be at full boost at 2k-6k without overheating the air

now if some one here has a FULLY balanced blueprinted 340 or any other short stroke long rod motor(8-10,000rpm) that is where your angry turbo comes in no low end but the motor is set up to advantage of the high rpm power of an exhaust driven turbo system.