Update!
The trip to the junkyard was productive. I bought two intercoolers- one from an old Saab 900, and one from a 1.8t Jetta. Both would work for my setup, but I decided to go with the Jetta intercooler. Based on where I'd like to mount it, the inlet and outlet line up very well.
I just need a 45° coupler between the throttle body and the i/c outlet. I still need to install the BOV somewhere in there, though.
The biggest update, by far, is that the engine fired!
I assembled this engine 5 years ago, so I didn't know what to expect when trying to start it. After redoing the timing belt (the cam was 90° off- oops!), it fired almost immediately. No leaks so far. It doesn't stay running very long, probably because the gasoline is at least 6 years old!
More to come!