Anyone Using a Small Block Gear Drive?

Any thoughts on this as an alternative to the milodon gear drive?
SMALL BLOCK CHRYSLER 273-318-340-360 V8 GEAR DRIVE. | eBay

Haven‘t seen that one before but for a first look I wouldn’t be afraid to use that. The idler is fixed.

I could only see the single page of the instructions the seller posted but it looks like it uses a bushing to adjust cam timing.

I’d certainly run that long before I ran a chain.