1969 GTS Drivetrain into 1964 Dart Question

Hi all, I currently have a roller 64 Dart sitting in my driveway and I'm looking to build a car for the first time, everything else I own at least had an intact drivetrain.

A coworker of mines dad has a drivetrain out of a 69 Dart GTS that he's offered to sell me and this is what I'm looking at, 383, A833 trans with an 8 3/4 rear end. It would be coming with all linkage, pedals and most if not all of the wire harness, suspension, steering, wheels basically everything was pulled from this 69 years back for a resto mod job that to my knowledge went nowhere in the end but the bright side is all the numbers are supposedly matching and everything included has all run together for the life of the precious car.

What I'm looking for is a little help in knowing what some of the obstacles I may be looking at in swapping this drivetrain into my 64 dart if I buy it. Any input or suggestion is appreciated and welcomed. I'm shooting a bit past my current ability but work in a shop with enough guys who are knowledgeable and willing to help where needed. A little more about my dart, it was supposedly mostly a drag car and ran a 383 and 727 with a ford 8.8 rear end (I believe) before I bought it as a roller.