360 - casting years confusing

[Cuda0000]

I thought I understood the casting #s but depending where I look online, the more I’m confused.
Driver side block: 4006830-360-6
Driver side below head: W360116261
Passenger side: 6

I get July 72, 1976, then depending which chart: 1971-1989, 1976-1980, 1971-1974, and. 1975-1993.

Not extremely important, just trying to narrow it down so I can order the correct oil pan, gaskets, oil filters, headers, etc.

Thank you in advance

 

[Vaanth]

Block Casting number 4006830 is a 360 used 1976 - 1980.

The listed engine number stamped below the left head, "W360116261" is incomplete. If not a typographical omission, the number might be mis-stamped, or lightly stamped or otherwise marred. The listed number denotes a 360 built at the Windsor, Canada plant. A leading model year number should precede the "W" and there should be eight digits following the "360". Engine build date is indeterminate from the listed numbers.

Symbolic example: 6W360MMDDXXXX, where 6=1976 model year, MM=month of build, DD=day of build, XXXX=the XXXXth engine built that day at that plant. Other numbers indicating oversize/undersize internal components or other select details can also be present

The block casting date is on the passenger side toward the upper front near the engine mount.