I agree , Chook , a manual valve is'nt ideal .
If you want to try the manifold you can have it & give it a go . The Suzuki thermo is a self contained unit & just sits between the inlets & you just run a short length of hose to each outlet , the main hose goes to the radiator . Get a VDO sender & guage & the jobs done.
Sorry to get off topic.
The weight of a Bing Carby would only be 200-300gms at the most (?) Not much when you think a T-bone & chips & two schooners would be close to a kilo .......

Eric