Interesting article

It's my understanding that with drag cars gear drives are not that beneficial when the load is pretty much directly positive keeping the chain assembly tight under acceleration and a small amount of timing variation under low load is not really a concern of mine. Gear drives become more of a benefit when RPMs are sawed back and forth in applications such as circle track racing or similar types of use. Also gear drives can produce harmonics and are less forgiving in their setups. For those reasons I would never really consider one for my application.