My '67 and '68 were both vented into the cab on the passenger side. Check to see if you have hose from the tank leading up in the corner of the cab on the passenger side...it is a vent!
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'68 C20 Longhorn 50th Anniversary 400/TH400
'68 C20 Longhorn 50th Anniversary 468/TH400w/buckets
'72 C20 Halfhorn (Longhorn w/o cab and front clip)
'69 Flxible Cruiser (look up ugly in the dictionary)
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