The old visible V-8 was 1/4 scale, and was a pretty close representation of the Chrysler Wedge engine series that came out at the same time as their first Hemi series. I think, but am not positive, that old design ended at 318 cubic inches, it ended about the time that the new Wedge and new smallblock started appearing in cars,,,,,look in a 1962 or so edition of Motor's Manual. (yes, there were two different 318 cid engines, a big one and a small one)
My cousin and I each had one back in the sixties, mine worked, but ate batteries, his had something bind up inside and the leverage cracked the crankcase apart at the glue seams.
He went on to be a devoted "Direct Connection" fan with his cars when we grew up, and I went another direction and went "Total Performance".
I mention the Chrysler stuff because I hope that paint color is some artifact of the internet posting process, because that surely is Chrylser Competition Engine Orange and not Chevrolet Engine Red-Orange
I've often thought that a row of those models on a shelf would be cool, I know there is a Ford SOHC, and a Chrysler Hemi,,, and some smallblocks,,,,,if they included a Chevy Rat with the Vette tri-carb, that would make an interesting display. Three? different companies make those, now.
Rex