look at the very top of your previous page. "lsx swap into obs" by redheartbeat
dbw = drive by wire which is electronic
dbc = drive by cable which uses a throttle cable like your current motor
58t is for gen 4 motors in 07-09 NNBS an other cars 4.8,5.3,6.0,6.2 its what the computer reads with the crank sensor I THINK
24t is for gen 3 which is the NBS 4.8,5.3,6.0 have