This is pretty simple really. Just an old aluminum carb spacer with some long bolts double nutted to it. I built this thing back when I was still living with my parents so it is at least 42 years old!
It keeps the carb linkage and throttle blades off the table when rebuilding the carb.
I have no idea what these bolts are actually for. I found them scrounging thru my dad's assortment of homeless fasteners.
The carb just sits on top of the nuts. No need to bolt it down as it sits well enough and the stand is just in the way when working on the carb anyway. It's main purpose is disassembly and reassembly.