You'll probably want the 36 wide, as long as you have the room for it to slide out of the way. You want some overlap to avoid being able to see in at a diagonal. The door has to be spaced away from the trim so it doesn't bang it (less critical if you have a floor guide to hold the bottom in alignment). I think the height will be ok. You can actually set the top farther down from the top of the trim because when the door is shut, you will be looking up at an angle and the door will shadow the top of the trim. But 3/4 gap at the bottom isn't really a problem in any case.
Without the 2 x 8 frame: approx 39 1/2 w x 74 1/2 h.
I think I would remove all the wood from the cement, not just half of it and also remove the top jamb. Then line the sides of the opening with some 3/4 treated plywood, glued and screwed to the concrete. Then make your own custom sized prehung door... get yourself a 36 door slab (a flush solid core door would be best), and some jamb material, assemble a jamb that is as tall as possible, consider keeping your hinges centered on the jamb by cutting some length off both the top an bottom of the hinge side jamb, then assemble the jamb. Then cut the top and bottom your door to fit your jamb and hang it on your jamb. Buying a jamb kit saves you from having to do half of the mortising. You will still need to mortise the door for hinges so they will line up with the jamb. Or if you don't mind doing all the mortising, just buy some poplar 1x8 to use as jambs and some door stop and diy. Then install that prehung door into the opening with shims and screws. You will likely want to install a long tapcon screw in each hinge to hit the concrete... and possibly countersink a few others into the opposite jamb as needed. You could buy a prehung 36 door as well, but most will be hollow, which means cutting a plug for each end you cut off.... and if the door is prebored for a knob, you won't want to just cut 5 off the bottom, it will make the knob 5 too low. Could be done, but it might be more work... plus disassembling a prehung jamb sometimes destroys it.
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