ID numbers on 383 block

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jim

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I am trying to ID a 383 I have. It is in a 68 A body. The block casting is 2468130-9
Also the stamps on the pad under the distributer has D383 12 28 R
also has the 2 threaded bosses on the front of the drivers side above the oil pump.
From what I read its a 68 block cast 12/28 ? What would the R stand for? Was there a HP stamped for hi-pef like the 440s?
Thanks in advance
 
D is the Series (model year) 1968

Is there a partial VIN stamp on the rear or the block? (top of the bell where the transmission mounts)
 
D is the Series (model year) 1968

Is there a partial VIN stamp on the rear or the block? (top of the bell where the transmission mounts)

Nothing at all the 12 28 is casting date ?
 
And yes, there are HP 383's. Just stamped HP.
 
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