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LwCwb--
Curious why you want the truck block, I assume a FT block?
Lots of 391 FTs have been bored to 428s because of the thicker walls but there is one drawback.
Its got a larger bore for the distributer shaft than the FE so you will need a special bushing to reduce the size down to standard FE if you are planning to run anything other than a truck distributer on it.
Good luck.
John
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