"Baselining" my 225

The 170 and 225 carbs are functionally interchangeable. A 170 carb is not jetted leaner than a 225 carb. Until '67, most of the 170 carbs had a 1-9/16" throttle bore and most of the 225 carbs had a 1-11/16" throttle bore; this is of no practical significance for the kind of driving one is likely to do in a stock old Valiant.

I would not spend $100 for a pig-in-a-poke carburetor, even if the air cleaner I wanted were included (and that air cleaner on the offered intake is not a '62 item)