Well that will work out for my favor at least. The block came out of a 1981 D300.
A little history on this block. Obviously not the original motor in the 81 d300. The motor $hit the bed a few months after I bought it. So I pulled it like I mentioned 20 years ago and had the block and heads magnufluxed. Turns out the heads were cracked terribly. Someone had put a set of magnum heads onto it without using oil through pushrods. Not sure if that's what caused the heads destruction, But regardless I kept the block and crank for all these years. It was in propane too, so it'll be going back to a carb with some 1974 360 heads. The long about works for me at least.