Need help identifying

These carbs were extra set that came with bike purchase years ago, can someone identify what they are?

VM26SS.

VM26SS used on the 1976 Kz900 and LTD 900, 1977 Kz900 and I think the 1977 kz1000?

Currently have Z1B carbs on KZ900 which carb is preferred? Going to run pods and Denco 4-1.

I have very limited experience with the VM28SC (Z1B) carbs. They were on my first bike many years ago. The treated me well, but were tuned when I got the bike. I have heard they fall out fo tune. The VM26SS are very solid durable carbs. The obvious advantage of the 28’s in more potential flow in the upper rpm. But the 26’s will be a little snappier off idle.