Hi Gumby,
Your 400 will drop right in, just change the motor mounts. The 1977-79 Thunderbirds are all the same under the hood, except for the mounting location of the cruise control module.
I put a 400 in my '78 after I did a few modifications and it runs very well.
460's will drop in with no trouble too but they're almost 200 pounds heavier than the 400, I'm currently working on a 460 to replace my 400 and it will be interesting to see how the 302 springs handle the extra wieght.
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