whats needed to swap a 454 out for 350 in 2000 chevy 3/4 4x4
 

im looking at putting a 350 in place of a bad 454 in my brothers 2000 chevy 3/4 ton 4x4. im sure it will fit fine and use tranny, radiator..etc... but the problem i am worried about running into is the COMPUTER. so does anyone know what would need to be done. ive gotten pretty good answers on this then some just seems to complicated and i would think there was an easier way around it. could i get the computer erased then reprogrammed for a 350 engine