Indeed, I agree with webster280z.
On a serious note, I say get a separate L24/26/28 N/A build it up triples, bore, crank, pistons, cam, headers the works. And then see if you need more power like others have said. With a built motor and mean compression you will have the right to say my car is all original and N/A with a mean sound and classic look and feel. Not to mention you can always swap in the orig motor no problem.
The Z already stands out regardless because its a S30 first gen. whenever you drive it you will get looks from a variety of people. Compliments galore and books of stores starting with " I use to have one of those..." And respect from the older generation. Its what makes driving a S30 that much more gratifying.