[rjs53]

The clutch fan should work, if not you may have to replace the water pump depending if its a short or long pump.
The disc brake I got from ECE, but you could go junking and pull the front off a late 72 or newer. I had a 65 and put disc brakes on it from a 74, with no issues. If you go 5 lug remember the back has to be changed also (new axles). I don't see why you can't put an Eaton or like in the rear in place of the open diff. I thought about going with a bronco rear, because their limited slip and have disc brakes.
If you go junking, you might find a complete set up with power disc and power steering all in one. The nice thing about some of the kits is every thing is new. Just depends on the path you want to take.