engine identification

Hi there, having some trouble identifying these v8 heads I have. They have no serial numbers on them. 019 on outside, aswell as 508 or 5 ( ) 9 next to a head bolt hole and 2E7 in-between valve springs. Aswell as the number 3 further down top of the head in-between the valve springs. I believe...

I’m just wondering if anyone can give me any info on where this Blue engine originated. The only thing I know about it’s past is that it was pulled from the back of a cement mixer, it had been used to turn the barrel for a few years. Other than that I’m pretty sure it’s had a re-stamp. which...