Original '70 block. Not a factory/dealer replacement block. If the engine has been rebuilt at any point, the block was probably "hot tanked" or jet blasted to bare metal and then painted that color.
Good point you made, I never thought about that.
Looks like I have someone else’s engine or block for sure.
Next thing I am going to too is pull the valve covers off to repaint and I will check the casting numbers on the heads to see if they are 69 or 70.
Thanks again