BB installation on A Body Dart?

The Dart I looked at has a six banger in it,
What steps do I have to take to put it in..
IE: Will the 904 work till I get a beefed up 727.
Any issues pittung the 727 in ( Tunnel fit etc)

Master cylinder ...room?
Engine mounts
Headers
Cooling
Drive shaft.

Thanks fellahs.
Wanted to ask before I make a move on the car.