Alot depends on the year of the J-45. Because of its association with Norlin and design changes like the square shoulders and long scale, a 1969 J-45 will be worth quite a bit less than a 1968.
If the guitar just has a cracked top, the repair is not a big deal. Since it is an older guitar, I would also check for bellying. While a bit of bellying down below the board and bellying up behind the bridge is normal and not necessarily a bad thing (the only old acoustics that do not exhibit this are probably really overbuilt) check and make sure it is not too extensive as this could also indicate repairs are needed to the bridge, blackplate, braces and what have you.
GOOD LUCK
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"You start off playing guitars to get girls & end up talking with middle-aged men about your fingernails" - Ed Gerhard
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