454 engine smog/air pump

[tucsonjwt]

I took a few pics of the smog pump on my 83 C20 454, but it is very difficult to see details. My diagram also shows a vacuum line going to the back of the smog pump, but I don't see any lines connecting directly to the pump. There seems to be a narrow rectangular piece attached to the back of the pump, which then attaches to a round canister. My guess is that you can just install the pump and as long as there are no open holes not attached to something it will pass.