And I can't imagine the part numbers were the same. I have seen a lot of LD4B's (just because I have owned a half dozen) with missing numbers and letters. These were sand cast and not the highest quality casting wise.
So I just went out to look again. Casting number on block is poor but best I can tell it's a 1966 block with 2 barrel Pistons ( used my scope on one cylinder and looks like flat top Pistons with reliefs for valves. On the plus side it looks like I can see hone marks on the cylinder walls which would indicate the engine was actually rebuilt with no use. Some moisture got into valley as some lifters are a little crusty but not bad, while others look new. I think plan now is to pull intake and heads, clean everything up, see what's still good and reassemble. Single point dizzy. Good news is the one cylinder I looked at didn't look Rusty. Hope the rest look good. May soak cylinders in evaporust once I get it opened up (and in valley) to clean it all out. Either way I definitely got my money's worth just in parts on the engine. Good intake, heads and all the right brackets, mounts and exhaust manifolds to do a V8 seat in my car eventually. Also came with 2 alternators, 2 starters, a new fuel pump, and spare dizzy. All this for $275 cdn, so just over $206 USD.
