91maroRS91

so i want to convert my maro that has a 305 tbi in it to a tpi motor. i was woundering can i just get a tpi setup and just put it on or should i just buy a tpi motor. im new to the whole tbi tpi and dont know the real differences between the motors. like are they the same motor but just have different efi setups or are they completely different. also if someone could tell me exactly what im gonna need to convert it. someone please help me!