When I put a T5 in my 65, I used the stock T5 shifter.  I cut the T5 handle down low, and welded the cut down original handle from a 66 3 speed shifter.  I did this for 2 reasons: 1) It keeps the vibration isolators from the OEM T5 shifter. and 2) by using the OEM T5 shifter, I could avoid cutting the shifter hole in the floor.  The 65 is one of those cars I couldn't think of cutting up.  I used a stock shifter boot, and it fit ok in my console.  

The OEM T5 shifter was way better than the original 4 speed shifter from the T10, but not near as nice as a Pro 5.0 shifter.  If you need precise shifting, and money is no object, buy the Pro 5.0 shifter, and one of the T5 swap handles like Modern Driveline sells

If you use all stock stuff the stock stuff will work.  If you use a real shifter you're going to have to cut the floor pan.  I cut a hole big enough to allow me to get the shifter on and off if needed.  I used a Fox lower boot without the metal ring to seal the hole, then made a stainless ring and used a Fox upper boot.  I used the '67 look shift stalk.  All of this for me is meant to be temporary.  Eventually I'm going to build a console and relocate my shifter to a more advantageous position for a shorter throw and better positioning of the ball to where its under where my right hand falls naturally. 

I have one of the look-a-like 67 shifters with the non functioning reverse lock out grad handles bolted to the TKO 600 that was configured to have the shifter come up in the original hole without any modifications. The 67 shift boot slide up from the bottom without issue and bolted down with the metal ring. 

I always wanted the look of the lock out shifter...... no that I have it, I'm not so sure. Those lock out handles seemed to scratch me any time I was moving my hand around the shifter. They are now covered in vacuum tubing.