So the argument is whether the name of the W74 engine is HO or R/A?
And the basis for the argument that the W74 engine is an R/A is 3 invoices, only from Nov 68? Despite that every other document presented (including order forms, window stickers, every other invoice, and advertising) show that the W74 is the HO engine and the T42 adds the R/A to the car?

And no less the invoice for a car that was built at the exact same time but shipped later in the year says HO. Which leads one to conclude that the option hadn't changed, just the wording on the invoice.

Any chance of getting the VIN's on the other two invoices? That would help to narrow down when this happened.

And noone mentioned the ongoing price changes for W74.......