Just picked up this V6 Need id

[joetx]

Just picked up this V6. Guy advertised it as a 4.1 Old? I think it's a Buick 231. Need to know what it is so I can start working on it. Here are some pictures and numbers. I couldn't find these numbers on the different charts. Also, can't find a number between the "1st and 2nd spark plug". Is it under the valve cover? on the block?
These are numbers I found:
front by the distributor...408
Casting number on back: E142
Number on the intake manifold: 25502243

Has and HEI, 4 bbl intake, 14 bolts on the oil pan

Thanks for any help you can provide. Joe.

 

[joetx]

OK. So I found this number closer to the rear of the engine not between the 1st and 2nd sparkplug. 25514291 and 41L. Looks like it's a '80-'84. Pulled the pan and found one of the piston journal off and the rod bearing laying in the pan. Looks like it spun a journal as the reason the previous owner pulled this engine. O.K. Where can I get a crank kit if I can't turn the crank down and put oversize rod bearings?

 

[Bob]

That journal next to the one exposed looks like it could be interesting to "uncap". Notice neither the rod bolts not the main cap bolts are from one set.