MANUAL AIR REGULATOR>>> All you need is a heat control valve from a 95-99 Camry or Avalon [part #74780], and a generic lever action choke cable [6 foot long, you can trim to size]. Make sure you get the valve with the bracket. You will have to bend or trim the mounting bracket a little, then you can mount it in place place with one of the bolts to your original air regulator. When finished you can use the lever to fully control your idle. Parts can be had for $30 on ebay.

Here's another Zombie Thread that may shed some light on your quest, http://www.classiczcars.com/forums/fuel-injection-s30/47447-help-me-understand-aar-please.html

I changed my hoses to the '78 configuration too, it keeps the AAR cleaner.