Which K frame would you use, given the choice?

So if you had an original 1970 340, 4 speed Duster you would change out the HD 340 K frame, front sway bar, and Kelsey Hayes disc brakes to the cheap 73+ K frame and slider single piston calipers? Then change out the 8 3/4 rear to an 8 1/4 rear or swap brakes and axles into the 8 3/4? Been there done that, made no difference after all that time and money. Not me, never in a million years. And I'm not a numbers matching guy.