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Only things I can think of are the intake manifold and the distributor. If there are headers on the 383 then may not work with the 440 because of the height and width difference of where the headers bolt to the heads. A possible clearance issue.

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Oh the headers may not fit??

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Stu you are going to have to lose that X pipe looking thing you have on there, lucky for you ...

As said , other than the intake and the distributor everything else swaps over. most all headers , other than maybe TTi's , are made to fit 383's AND 440's in the same, and most times , multiple , body platforms ... but if you have a welded H or X pipe they will only fit either a 383 or a 440.

What are you using for an air cleaner ? If it's a stock Ari grabber type that will not swap over.