I'm going to put a big block in my 318 car as well, I've asked on the site about the K-frame, and wether or not it has to be changed to accomodate the 440. A couple guys said I did'nt and that I just needed big block mounts, but when I called a supplier for the mounts he told me he did this swap in his shop, and they had to change the k-frame. It sounds like you've been there, what did you do? Thanx.