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How to know if a engine needs rebuilding?

Strip,inspect and measure is the only way I know.
Yep, but if they are both still intact and will turn over, you can do a compression and leak down test on them to get an idea of what you're working with. Neither one of them seem to be overly high mileage, but in your description I can see why you may be concerned.

I could use one of the heads if you think of getting rid of one. I have an 84 700 that has broken fins and looks to be JB welded. There is no leaking but it doesn't look good.
 
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