Blueprint 408 cooling system questions.

There’s many ways of looking at a situation like this. The way I see it, If your the sort that buys essentially a bolt-in engine and add your own peripheral related parts and then have a problem the first reaction is to blame the engine assembly, and reach out to them for answers and defend your part of the equation....as in: “it just can’t be what I’ve done”! I’ve seen it countless times. On the other hand if you did all the work yourself assembling things you’re going to likely be giving thought to everything related to what YOU did. This particular issue is not because of the engine block cooling cavities being blocked or scaled up, the head gaskets being incorrect, or blocking any passages to the head, or the head having any of the same issues that a block could have. It’s the peripheral things that an end user has control over. Sorry, but that statement gets a “Period” . It ain’t the engine, it’s what an end user (applies to all not just the OP) has or hasn’t done, either by overlooking, wrong parts used, tuning, not considering everything as you would if you built and assemble start to finish.