To keep the carbs from slipping down under vibration I fitted a support spring which kept tension on the top connecting rail of the carbs but still kept the vibration isolation.
Also fitted an O-ring between the the carbs and manifold ( same size ID as the silicon connecting hose ) which stopped any metal to metal contact.
Because I'm sqeezed for space in a Clubman 7 the carbs bowls were a little close to the headers than I'd like, so they got heat wrapped and a heat shield also for good luck.
Mik - what accelerator cable did you use ? - mine was a combo corolla/ suzuki to keep it low and under the hood