318 to 360 swap

What year would be good for a donor car? I thought that I would change out the K member and all of the suspension parts
if it has the '72 or earlier K-frame, just use adapting mounts. If it's '73 and up, you can use something like the Schumacher mounts or swap K-frame. /6 cars have a lighter duty torsion bar, but I don't change them when I swap.