Change in mikuni carb mm's

Just some more fuel for thought,,,,,

I'm not sure when Husqvarna did the exact upgrade from a 36mm mikuni carb to the 38mm mikuni carb. The 36mm was in the '77, '78, 79. with smaller transfer ports. There was a power upgrade with larger transfer ports and the 38mm mikuni carb was added but I'm not sure what year the upgrade happened.
My point if your building an older bike with the 36mm carb you can upgrade to the 38mm carb. Since the spigots are the same size it's a easy swap.