Recently acquired a 1967/68 383 block & heads, and what's supposed to be a 727 tranny.

Here's what I've determined so far:
Bloc casting number 2468130 9 - 59-71 383 B block. Below the casting number is "LL". I'm stumped here.
Date cast into the block is 12-6-67
Deck plate stamps: D383 (says it's a 1968 383ci); 12162 - this does mean the 2nd block assembled on 12/16, correct? Yes, I realize that casting dates and assembly dates are not the same.
Head casting numbers: 2843906-1 and 2843906-6. What do the -1 and -6 mean? I do know these are 383/440 '906' heads, 1968-1970. Also on a tag near the casting numbers: 01608 (on the -1 head) and 0160B (on the -6 head). They might both be 8, or B, but one looked definitely rounded and the other definitely flat on the left side of the letter/number.
I haven't gotten the engine torn down any further yet, acquired as a block & heads, so I don't know for sure whether it's a steel or cast crank. I was told steel...
On the underside of the engine, near where the starter mounts, I found this number: PT383P23321129. I expected to find a VIN there, but I can't figure this one out. Is it possible that this is a marine/industrial motor? If anyone can decode this for me, well...

I'm not very good with transmission identification. Can someone tell me where to even look for casting/identification numbers? The only numbers I see are "103-5" on the bellhousing, in two places, and it appears to be cast vs stamped. I can't pick it up to check pan shape - with my parts store background, that's my first option for id'ing a tranny - and I wasn't watching when they loaded it in the truck.

If you need more information, I'll call hubby from work tonight and ask him to please look. (Yes, the 350s are his, but he drives a Ram)

Also picked up the differential gears for an 8 3/4" rear end, I'm guessing 3.23 gears (fine for me, will be driving the car to/from work some, and it's a long drive). Axles/differentials/etc are hubby's ball of wax, so I'm letting him worry with that part