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Hey NJ, on the other side of the block .(almost opposite in area), there looks like a vacuum diaphragm thingy, goes there! Heres a pic, the top ones in the photo are the heater pipes
Mine also has a vacuum pipe that goes into the firewall (someone has put it in aftermarket) for a vacuum guage. It is T'd off about an inch and a half from where your missing pipe is to be attached. It must do something then
But to me it looks (from your picture) like it runs to the fuel pressure regulator to up the pressure under higher vacuum. And that explains why it ran like a bag of shit when it warmed up last time and smoked (rich black boyracer type ) - I had the fuel rail out, exact symptoyms. Finding out more and more by the day!