My 1987 Bronco has the original I-6 engine and am considering installing a big block 360 that I got out of a 1979 250.
What kind of problems should I look out for?

 

Well for one, the 360 will not bolt to your transmission. Sell that 360 and buy a 302 or a 351W. Both of those will bolt to your trans. You will need the correct engine mounts, flywheel, and exhaust. The 360 would be one of my very last choices as a retrofit engine. All the small block install parts are available, since they were installed from the factory. The 360 never was. With a small block, you will not have to change any of your drive shafts either.