[toms68cst]

That top picture that Steve Haffner posted is very interesting to me as it is nearly a dead-ringer to my engine compartment. That also brings up another can of worms. The old Smog-pump vs heat riser question on 68's.

From what I can figure out 68's with automatics had heat risers and 68 manuals had smog pumps. I think there may be another set of rules for 3/4 tons and 1 ton trucks as perhaps they were not required to have emmissions controls. I am not sure though.