. https://southjersey.craigslist.org/ctd/d/trenton-1964-ford-galaxie-500/7564239554.html "Z" code is a 390
I think he's playing word games with his ad. Q's and R's are 427 codes, Z's are 390's. And he never states that the 427 is the original engine. Maybe he should have said "Originally a Z code car" instead of "Original Z code car".
In addition, if I remember correctly, a 427 could not be had with power brakes because of marginal vacuum under some driving conditions. So I suspect he's faking it.
I do see a double bowl master, proportioning valve hanging under it, and what appears to be a small diameter booster. Somebody's concoction or dream car, probably just to flip for a quick buck.