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Re: The writing on the block….
The heads you have match up providing they are L 2 70.
If the casting date of the block actually says 0 then its most likely original to the truck, and would be a late december 70 block which is correct for an early 71 truck
It appeared to be a 9, but its real hard to tell??
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70 GMC shortbed fleetside with a 72 chevy costume
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