I am so glad I didn't try and put the T56 in my '74. I originally bought the trans and the swap parts to do all of this to that car but when the '73 became available I transitioned the swap to the '73. After the cuts to the floor I wouldn't be surprised if I would have been so disheartened that the project would have stalled and died.
Nah, it wouldn't have died. Its just metal! I get more satisfaction out of making something my own, over keeping something "true". Build stuff the way want it and let the purists worry later..
So that's your floor now, in the 73? I like where it's going.