Big Block Engine Codes

[Seanext]

I bought a project truck that came with a 454. I am having trouble finding the correct info on the engine. The casting number is 14015445 which is a 454 1978-1990 2 or 4 bolt main. The only numbers on the pad in front of the pass head is either 1JJ506838 or JJ506838. The first 1 could be a scratch as it is faint and the other letters and number are strong stamping. When looking online there should be two numbers on this pad but I can only find one. I looked above the oil filter on the pad but is still rough never machined down so there is no number there.
I have tried all the internet searches but I could not find anything. Any help would be greatly appreciated as I need to get parts for it.