I still have a Mikuni sidedraft for the G54B. PM me if anyone is interested as I previously listed it in the for sale section. The 44s are what JB recommended in the day. I have a brand new Mikuni manifold and linkage kit that's why I'm selling the used one. The carbs can be had on EBAY fairly frequently buy a bit pricey The rebuilding kits and all other parts are available from Wolf Creek Racing in New York. Actually, we's the world-wide distributor for the PHH carbs. I have a number of articles from back in the day.The Mikuni carbs were generally thought of to be superior to the Webers because their mounting and ability to hold tuning and adjustment were superior.