right our 78 was no cat, no pump, no vapor cannister. passed strict state (not in CA though) emissions for 22 yrs.
more info here:
esp. "...The 1979 Bronco was basically a direct carry over from the 1978 models. The big difference for the 1979 model year was a full array of emissions equipment, including smog pumps and catalytic converters, that were now standard on all 1/2 ton trucks. Probably the most amazing accomplishment for the '79 Bronco was that Ford managed to satisfy the EPA emissions requirements with very little, if any, loss of performance over the previous model year..."
Click 78-79 Bronco Literature
& this thread by Paul in this post
& by JginVA - they discuss 49 State vs. CA emissions reqmts. & stickers; esp this: "....Another change was the placement of emissions stickers. As was correctly stated above, 78 Broncos had this sticker on the driver’s side valve cover..." check to see if you have ths sticker intact..& then read this by CA MV
"What You Need to Know Before Buying a Vehicle from Out-of-State"..maybe you qualify for one of the exemptions?
Late Model (1978-1996) Ford Bronco History
"Information on 1978 Bronco specifications was taken from the original 1978 Ford Bronco brochure.
Yearly Bronco update informaton was taken from Ford Truckin Magazine, Winter 1997 Edition. Article Titled BRONCO 30th Anniversary written by Trent Riddle.
Bronco FAQ by Matt & Ray at off-road.com
*** - Bronco FAQ: general, history, TTB definition & description, tires/lift chart, suspension, tailgate, drive line, camper top, body, engine, transmission, axle/suspension, transfer cases & locking hubs ID & swaps, miscellaneous, tips & tricks, etc.