I am running a Saab 900s intercooler. It fits in a mk2 very well, at least with no a/c coil... It's kind of small though, and the air doesn't go straight through but has to make a turn to get out.
I mounted it upside down from how it goes in a Saab.
StarQuests were all over the junkyards here a few years ago. I still occasionally see them but they're one of those cars that really disappeared from the roads, compared to say the 300zx which you can still find. I want to find the hole they pushed all of them into...
Here is mine using a Mazda intercooler. I modified the inlet/outlet orientation to suit my application. I have also modified a Mini radiator to allow fitment.
What mazda did that come from. This is exactly what I was thinking of doing to get A/C back in my car...no room for condensor.
Im trying to find the exact application. This build was a total used parts modification build. Its very similar to this
OE supra intercooler
There are plenty of used OEM coolers on ebay. I would take your time measuring the space you have to work with, and research dimensions for the stock coolers. You should be able to make just about anything fit. Keep in mind the Mazda intercooler was not a drop in. I had to weld new tops/brackets to make it fit correctly.