Need help-Did 1978 W 150 trucks come with cats??

So I am trying to figure out if my 1978 W-150 came with a catalytic converter from the factory?? I have been trying to sell the truck for 6 months and now I have an interested buyer. He is telling me his "friend" that owns an exhaust shop says the truck came with cats but I am saying that they where not mandatory until 1979. Is there a way that I can conclusively prove to him either way?? I just ran the truck through deq here in Oregon and it passed with flying colors?? So surely if it was an issue they would not have passed it.

What's your GVW?

What's the sticker under the hood say?

R.

I am pretty sure that a D or W150 which is a heavy half ton had no cats in 1978. Ron.

Does the dash have a "unleaded fuel only" decal neat the gas gauge?

Some did and some didn't in 1978.
It is not required on 78 trucks.

So I finally talked the guy off the ledge and showed him the deq slip again and he bought the truck Now I am truckless and will miss my Power wagon . Thanks for the help.

now your member #2 in the "Truckless Club
'.

My Sweptline's been gone almost a month too. No more Dodge trucks for me, I'm keeping the 05 Cummins though.

Sheldon