Trying to restore a 68 dart

[Birddog1]

I have a 68 dart /6 car that I am putting back together. I grew up with this car and one night in my youth after one too many I bent the k member but no frame damage. I want to upgrade this car with more power. I found a 75 dart with ac disc brakes small block and 83/4 rear. I want to use this car as a donor. My question is will all the desirable components bolt up to my 68, k member, ac, rear
Thanks for the help

 

[1970Duster]

Yeah (though the AC will be a b**** to mount to a non AC car).