Tim,
Is the hose connection you are interested is shown in the picture below? The small hose connected to a metal tube fitting (behind throttle linkage) goes to the brake booster. There is another hose connection near it. Plugged it.
The upper oil tank hose connection goes to the back of the CIS rubber boot and the lower oil tank connection is for the engine breather hose (braided hose shown in the pic.)
Could you post picture/s of your engine in question. Thanks.
Tony