Have you sonic checked 360 or even 318/340?

Aussie - You're buddy got a good one but I would doubt what he said. Let me clarify that - if he has .150" on the pin axis that's great. Way overkill and the thrusts should be way over .200 - but this would have meant they astarted at almost .300 which is highly doubtful unless it was core shifted to the major thrust side. If he has .150" on the minor thrust, still good. If he had .150" on the major thrust which is what most guys that "know" talk about - I wouldn't brag about it and it would have failed by my opinion depending on his planned use. My impression is he's wording it to make it not a big deal for you. It's not a big deal to him and that is his block. It might be to you on yours. Invest a couple hundred before you commit thousands basing the decision on some authors and a friend's singular result.
I've built using the earlier blocks but that was my pre-sonic tester days. I have tested one for someone - it failed due to core shift in the whole bank - IIRC the even side bank was crooked. Meaning the sand cores were not placed in the core box properly, and the result was castings that were cocked between the deck and main web sections of the block.
You have to read the books with a grain of salt. I own the ones you mention plus a couple others that predate them by decades in the case of Szilagyi. The information in those books is based on published fact. It's a fact that for about a year give or take (cast in 71 and early 72) the first 360s were cast using the 340 block core boxes. But, the reality is the guys casting them were... less than ideal in terms of quality control.
Once I bought a tester and started playing with it - not testing a few spots on each bore but really testing all over and developing a "picture" of the cores in the block - I found that vitually all mopar blocks have core shift. Some in the right direction: the major thrust, most in directions that can potentially cause problems: minor thrust (driver's side of each bore), pin axis (front or back of each bore), or leaned over rather than perpendicular to the deck and main bore. It can be one hole, or the whole bank of cylinders. We are talking the cores here, resulting in the iron being thinner than the engineers specified in particular areas. That's not something the printed records will show because the blocks were production parts that were used and operated fine. The early books almost never mention sonic testing because the technology was not cheap enough to make it worthwhile on an automotive engine. Also - if you don't own a tester and have to pay to have a single block tested - you may swear that what's written is the truth and it's true on your engine. It's my opinon that while it is the truth based on print, reality most times does not reflect the intention of the designers & engineers.
It all comes down to "have every block tested by a competant guy with a good tester". That will seperate "the truth" from your individual "reality".
If your sonic test results have less than 20 readings per hole you cannot accurately determine what the shape and placement of the cylinder casting really is, nor the thickness trends that would indicate possible failure points. If you pay for insurance make damn sure you get a result that lets you make an informed decision. If you chose not to - that's all up to you. I'm sure polls would should a lot of succes with the "just do it" approach but that's little solace to the few that were not successful and spent the same $$.