With the XE274 you should be where you want to. Will be a nice running combo and will be able to use the stock rockers/pushrods. I would highly suggest running headers with that cam. Also make sure your rear gears and torq converter are appropriately matched. And be ready to curve your distributor and tune your carb for the new combo.
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I really would like to do the 440source heads rather than the Eddy's, but, I'd have to send them to someone for cleanup/inspection before bolt on. Which everyone seems to recommend.
The eddy's you don't. So, toss up.
FWIW I bolted on my 440source heads without sending them to a machine shop first. No problems yet and my car didn't blow up. You can take this for what little it's worth but there's guys on here who say eddys need their valve guides honed and valve job checked before using them, and there's guys who say 440source heads need the same. Then there's guys who've bolted either of then on straight OOTB without problems.
