This is a very good comparison, with dyno results.
I have a 383 that was built by a company that is not in business any more. its a 4 bolt main late 60's block, (I'd recommend a one piece rear main block if you can get one or have one), 400 crank, Eagle I beam rods, some flat top pistons, (I cant remember the brand of right this second) some 195 CFM heads, comp cam, dual plane intake, Holley 770 street avenger carb (maybe slightly too big but its what I have).
the 1300 to go 383 over a 350 is worth it to me. I cant give you a power number because I don't know, I am currently redoing the exhaust. the shorty headers that were on it only had a 1.5 inch collector and a factory looking pipe on it.
Hope this helps in some way or at least gives you a direction.
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