Houndoc, Rick is right, no 302 and probably a 351M or 400. Here is some information for you:
"1978: The Bronco was offered with a 351M or 400 V-8 engine. Both engines had a 2 bbl carb, a T-18 granny first gear 4 spd manual was standard while 3 spd automatic transmission was optional. The transfer case had a 2 Speed w/1.92 low range ratio. Rear axle was the Ford 9" while front was the Dana 44. Front disc brakes were now standard. Round headlights were standard, while square headlights came with the XLT option package.
1979: Square headlights and emissions control equipment, specifically an air pump, vapor canister and a catalytic converter became standard."
If you want to know anything about Fullsize Bronco's or have any questions you can go over to FullSizeBronco.com.