No k-frame change needed just get the mounts from schumacher creative. you will also need a small block trans., exhaust manifolds for a 64-66 or headers from someone like tti, dougs, spitfire, etc., V8 centerlink for a 64-66, and a few other odds and ends. But that about totals up the major changes.
I converted my '64 a few years ago and its a pretty straight forward swap.