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I'm sure the all Japanese and all Nissan had some effect on the price but at $70,000 the egos of the final 2 bidders has to come in to play as well. I think you're right about a Z with a big block 572 but not because it is an American engine, it's because it's just not a good match for a Z, it's simply too big, too heavy and not at all in the style of a Z. The RB26 on the other hand fits perfectly with excellent power to weight ratio for a 240z and is very much in the nature of a nimble sports car. Dumping a monster engine in to a small light car although kind of fun in some ways will never result in a well balanced car that is capable city traffic, hwy cruising and occasional track days. I'm sure the owner/builder of that 72 240z/RB26 spent close to final price finishing that car, maybe less if he did everything himself, maybe more if he paid someone else to do it. I think the new owner paid a fair price considering.

And a picture of how the unknown brown stuff held up