There is a vacuum line behind the throttle bracket right down at the bottom of the carb on my 88. I have to get right over top with a flashlight to see it. If you want to take the carb off just make some tags up out of masking tape and number them. Make 2 of each number from 1 to 10 say. As you pull the lines off, stick a tag on the line, and a tag on the nipple it came off. That way you can put them back in the right places. This way you can replace the gasket and check out all the lines and fittings with the carb off the manifold.