Firstly, a full service...
Tubular intake manifold, gen 1 injectors and fpr, exhaust system. get it mapped on emanage..
You can change cams and springs but i think you might need to raise rpm limit to make use of the powerband if you went with the available 4efte cams. (not sure)
Or you could bolt on a turbo and get it mapped on an emanage ;)
Staying n/a you wont make more than 100-110 bhp unless you swap upto a 5efhe.
Last but not least i think Chris Green makes ITB kits for 4e/5e's