Hey rusty, I have been waiting a year and four months for an update… have you poked around on slantsix.org?
Timing Gear for Slant 6 - Slant Six Forum
I am not sure but it looks like some guys in kangarooistan made one a while back.
http://www.slantsix.org/galleries/lasvegas/geardrive.jpg
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You may want to take a look at the milodon small block gear drive, maybe apply that type of design and order the crank and cam gears, and a single idler gear with the wishbone. Would you really need both idler gears?
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Milodon 13000 Gear Drive Assembly
Milodon Gear Drive Components