Re: vacuum hoses
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The dizzy has a vacuum advance and vacuum retard, the valve on the thermostat housing was designed to provide timing advance when water temp is low, there should also be a tree on the intake manifold , all can be disconnected with out hurting economy, except vacuum advance, this is the one at the back of the dizzy
The vacuum advance should work from
about 1500 rpm up, can be checked, by disconnecting the hose to the dizzy over a few thousand rpm, the rpm should drop.
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RS2000 5 speed
Twin 44idf webers + other goodies 
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