Those look like "block hugger" headers that interfere with the motor mounts in a truck. I used '69-'70 Chevelle "shorty" headers for minimum ground clearance.
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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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