Trany Opinion!?!?!?!

Me and my dad are building up a 68' barracuda fastback, were hoping to get atleast 500 the the rear wheels. the car has no engine and trany in it right know. Right know it has the clutch pedal and linkage on it. We had are minds set on a 727, but it is getting stressfull trying to find a good console for less $. I Know one of the hard parts of switching a automatic to a 4 speed is to hang the clutch pedal assembly witch is already in it right know, so that is making me think twice. Im also thinking speed and 1/4 mile times? What should i do?

- thanks