I can't offer a whole 'lot of advice, other than to say I am going to be giving this a try this winter in my '57 Special. I'll be attempting a 455 swap, and I do know that both the 455 and the 364/401/425 Nailheads are 28 inches wide.
What car will you be doing this in? I imagine a later year, '60s car would be a heck of a lot easier than a '50s setup.
I know I'll be running into a lot of custom exhaust work, and maybe an issue with the steering column?
You ought to check out the reference section here, as there's a lot of good stuff on dimensions and weights (you'd actually be dropping a few pounds going from a Nailhead to a Big Block!).
Good luck with whatever you do, and I'd be interested to see how everything goes!
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