You only have to change the dizzy, alternator and injectors depending on what harness you use. You can also always get an alternator that'll match your harness (if you have an OBD1 harness, get an OBD1 LS alternator, same goes for dizzy). If I remember correctly, OBD1 and OBD0 have the same injector clips. OBD2 are different. If you do it right, it'll go together easily. You just have to think about it. As far as which intake manifold to use... Use an OBD1 intake manifold. Would just make it easier.