Part numbers 2706K and 2708K are the same linkage kit (2706K is for the the 1939-1952 Studebaker 6 cylinder). As such, either part number will work with your manifold.
Holley, under license from Weber, manufactured the 5200 and 5210 carburetors. The 5200 was used on Ford application while the 5210 was used on GM applications. There are a few differences between the carburetors, but are they related to application specific items...
