will a 97 nissan 2.4 fit in a 87 nissan both king cab trucks

Hello, You would need to move the entire engine control system component from the 97 into the 87. 87 is an OBD-I system and 97 is OBD-II. About as compatible as windows and apple. The 97 system will rely on computer control where the 87 relied on vacuum or mechanical control.