Not Ranked
Unless your planning on very high RPM's don't bother, chain drives have worked just fine in millions of engines.
The gear drives require more lubrication than chains so you could be looking at block mods. In theory you'd think they'd be better but I've heard of more than a few failures over the years. Valve timing would be better at 8,000 rpm with a gear drive though. The main failures seem to be the carrier for the idler gears coming apart.
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