I think pretty much every Hitachi carb made in that era has a sight glass. I know the one's on the Suzuki Samurai's had them as well.
IDK.....I started in Subies with Carbed EA82s.....then when I got my first EA81 I was excited to see that setting float levels would eb so much easier with the sight glass.
I really don't think most EA82 carbs had the sight glass.......but I digress.......
To the OP.......you do know you need to swap you're disty out to a conventional one, right? it won't run off that 4 wire optical one in the car......espescially without a harness or ECU!