I like that the electric heater starts warming up instantly. You don't have to wait for the engine to warm up for an effect. You could even turn the key on for a couple of min before start-up on a really cold day.
I was thinking about that too although I have a wideband O2 sensor that shouldn't be set warming up for too long or it can burn out, I'm just gonna wire a switch straight to battery although I'll have to remember to shut it off after driving if I don't want to run it dead lol.
JoeSBP I looked at the heated carb spacers but it is the intake that needs heat more to keep the fuel vaporizing as it travels through the manifold. When the manifold is too cold the fuel condenses on the port walls and when the vacuum drops from opening the throttle all the fuel drops out of suspension causing a momentary lean stumble followed by an overrich condition (black smoke) as that extra liquid fuel is sucked into the cylinders. It's a very common problem on modified inline engines, if you check out Clifford Performance and search the web a bit you can find write-ups about the problem.
Also if I was still running my old aluminum Carter a carb heater would be nice in winter but with this Street Demon the plastic body keeps the fuel temps more consistent, only the baseplate would be heated.