most guys get away with using the manifold mounted choke stove/bimetal spring without the crossover valve by adjusting the choke linkage so it's really loose, barely closes even on a cold day. Now if it's an iron intake manifold and the heat is blocked off at manifold gaskets there will be trouble. You can still run the divorced choke but you'll have to set it up really, really loose as the bimetal spring won't see any real heat. If you set it up tight enough to actually act as a choke it will choke out the engine as it warms up. Lots of black smoke, gallons of gas burning doing nothing but fouling the plugs.
Kinds depends on whether you want it to work right or look right.
