I had a 350 engine put into my 88 camaro and I think the guys hooked up my vacuum tubes wrong becuase now my heater doesn't blow anything close to warm air. These guys are idiots and since have gone out of business. Does anyone have any idea how the lines should be hooked up? Diagrams, pictures, descriptive info, etc would be helpful. Any ideas of what I should check first?
Thanks!

Welcome to the Club! Lots of good people here and good info.

You should have a gray vacuum line, 1/8 inch diameter, plugged into the manifold for full time vacuum. If the car has TPI (Tuned Port Injection), a round cylinder, sorta, on top of the engine, then the tubing should be connected to a nipple on the passenger side of the large plenum.

If the engine has a carburetor looking device in the middle of a flat manifold, then the tubing will connect to a nipple behind the TBI unit (Throttle Body Injection) and in front of the distributor or from the base of the TBI unit.

This gray tube supplies vacuum to open/close doors of the heat/AC unit as you know.