Cam Gear Drive?
Call Milodon and be done. There is a TON of bullshit out there about gear drives. Don't use a floating idler gear drive.
If you install a gear drive and it makes noise, you screwed up, not the gear drive.
I know my exact am timing and piston to valve clearance when the engine goes together. I know what it will be after break in, and I know what it will be 100k miles from now.
They don't take more power to drive than a chain, or a belt.
I'm still waiting for someone to post up verified results of the HP loss of a gear drive, and also the harmonics transfer bullshit as well. I've never seen ANY of it proven.
Buy a quality gear drive and never look back.