Well I have solved the block problem and purchased one on flea bay that a guy bought, machined and then changed directions. I got a good deal on it considering it is ready to bolt together. Of course I will have my engine guy look it over before I do anything. It is a new Boss block!
You might want to measure the cylinder walls on that block before you buy pistons . . . in many (or maybe even most) cases, the pistons themselves are the specifiied bore diameter, and you will want to make sure that the pistons you buy have the correct clearance, or you'll have to have it re-machined for the next size larger.
For example, if you're going with an economy stroker kit that has hypereutectic pistons that are exactly 4.030" in diameter, you're going to need less piston skirt to cylinder wall clearance than you would with a forged piston, and vice versa.
Now, if' it's only bored 0.30" over, and it's one of those thick-walled blocks that can take up to a 0.125" overbore, then it would be one I'd consider but I sure
wouldn't consider it if it can't take more than a 0.030" overbore, for the reasons specified.
Also, different forged pistons required different piston skirt to cylinder wall clearance figures, too.
IMO, a block that has already been machined isn't my first choice (except for the example above), simply because of this reason, and also because you don't know the quality of the machinework. It could very well be that the reason this guy sold the block is because the machine shop screwed up.