Re: 68 L78 heater hose
If you look to the right side of the photo you can see the CH tag hanging on the check valve outlet. The rubber vacuum line holds it tight against the valve. Hard to see the tag due to the flash.
As far as the heater hoses go, when I restored the 68 Yenko I researched this quite heavily and determined the lower hose (to the water pump) had the GM stamp and both were ribbed. Hope this helps.
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