Yet another 292 Identification Help Request

[Portland68]

Picked up a 68 K2500 yesterday that had the V6 swapped out for an L6 and I’m having trouble identifying whether it is a 63 or 73 block.

Casting number is 3851659 (63-76 292)
The number near the dipstick is CON2 ?243, the ? Could be an I but that doesn’t really matter, 24 should indicate the 24th day of whatever month, 1963 or 1973.

The tricky part is the engine code is F1029PG and I can’t find that suffix anywhere and the by the numbers books don’t give any love to the inline sixes.

Any help would be appreciated! Picture of the latest rig I saved from the scrapper included.

['68OrangeSunshine]

If your 292 L6 has original paint, that might be a clue.*
Model Year '63 is Alpine Green.
MY '67 - '72 are Chevy Engine Orange.
Later '70s are GM Blue. [Don't have exact timeline - no Squarebody experience.]

L6 Dress Codes [3-letter suffix] are incomplete. My '68 C/10 Stepside has a 292 with the code ''XAE''. I have never been able to decode it either. I'm pretty sure this is the original block. It was the engine in the truck when I bought my Orange Stepside in 1973. I don't know if the Original Owner got a replacement engine under warranty or not but XAE is an unusual code. Replacement is my theory.
I pulled the XAE engine in 1977, rebuilt an MY'67 engine UH, and ran that 25 years. Then in 2002-05 I rebuilt XAE and it's back in the Stepside.

Another possible clue is that pre-MY'70, Dress Codes had 2 letters, and MY'70-and-later seem to have 3 letter codes.

* But if your 292 was rebuilt, the builder may have repainted it in any color of his fancy. Also some rebuilders will even obliterate the dress code or make their own markings later.

If your engine is still mounted to the transmission, you can't tell, but if you can see the end of the crank, '63 - '66 292 will have one dowel pin and six 7/16'' bolts. '67 and-later 292s will have three dowel pins and six 1/2'' bolts holding the flywheel on.
The later 12-lobed crankshaft is held to have superior balance.