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Quick no-photo update: spent most of today analyzing the snippet of schematic that AEM sent me for their VANOS drivers and hundreds of potential alternative motor / solenoid drivers (the TLE5205 they use is only available as surface-mount and I don't want to have boards spun yet). Turns out that bridging the outputs of the cheap and cheerful L298 dual H-bridge driver provides nearly identical performance to the TLE5205, and the L298 is still available in through-hole packages.
Sometime this week I will prototype the IAC and VANOS solenoid drivers with parts I have on hand (woo! That never happens!) and hopefully the parts I need to finish the water and power steering cooling systems will arrive. Prototypes of the drivers should be good enough to deal with cam break-in, getting the car to idle, and the dyno tune / engine break-in.
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