/6-904 to 360-727

You have a Mopar factory console shifter? If so, make sure the new trans has the holes on the bottom of the trans for the shifter shaft bracket

The K member "can be" a whole separate "deal" from the rest of the brakes / suspension

Example, my car...........I could not do things "all at once" so I converted to a late 73/ 74 K and put all the old 67 suspension on, temporarily, except for the oddball 67 idler, part of the reason, LOL

Now is the time to worry about a K because you either need a V8 K or to spend money on /6 - to - V8 "swap" brackets. Spool mounts are far superior and actually easier to come by so far as engine mounts/ brackets

You might be surprised.........if the /6 radiator is in good shape, and the 360 fairly mild, it just might cool it "for now."