That Swap is easy as pie, for the correct look your best bet is to find any original condition 65-69 big block c-body being sold and get photos from it. e-bay, craigslist and such always seem to have a few, just get in touch with the owners and request pics, even if you have to offer the guy a few bucks for his time taking specific shots.
I do not know that the 440 looked any different from a 383 car either, and no-one will really know or care if it is not 100% looking.
here is a really stock 383 in a 65 which can be used as reference. and I would love to buy the car BTW
http://minneapolis.craigslist.org/wsh/cto/3871829008.htmlAnd a pic of the really basic 440 motor in my Fury, it will be getting an aftermarket A/C next