I believe there are around 10 solenoids in the carburetor system. Some of them have an obvious purpose, for example the a/c idle boost solenoid valve raises the idle when you turn the a/c on. But, a "Cranking Leak Solenoid Valve" is not something I've come across before so I can't tell you what it does.What do the solinoids do on the dual carbs?
I've never owned a carb'd Lude so can't help you here beyond obvious stuff; i.e. if you have removed a/c then you will no longer need that solenoid.Can they be bypassed somehow?