Fuel cutoff solenoid prevents pulling unnecessary fuel through the lines during key-off engine revs. I don't know how old your carbureted car would have to be to lack a cutoff solenoid; I think Toyotas had it in the 70s.
But it makes a huge difference to let it run down to idle and run there for a second or two before keying off. Turning off while still at high revs pulls too much fuel through unburned, and it almost guarantees a nasty backfire at the next key-on. And if you look back through my history, you can see where a backfire blew my (admittedly cheap) muffler wide open. So I spare a few milliliters of fuel to prevent that. It's worth it.
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Lead or follow. Either is fine.
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