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ChevyBill...What did you end up doing?
We can all add our suggestions but your decision is the one that counts!
A newer GM crate motor will have a warranty, buying a used core can leave you guessing when it comes to damaged blocks, internals, etc.
However, most of us like the whole assembly deal!
I prefer to use an earlier block that was casted thicker than the newer ones, alike the crate motors; these crate motors use thinner castings on heads and blocks.
Earlier heads can always be massaged to adhere to your performance demands!
Remember that pump gas is what we have now, build it accrdingly if it is a daily driver.
Otherwise , you can upgrade to whatever you desire if you want more...it's up to you!
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