the real question is this a DD or a toy and what fuels are available where you live. if you have e85 or 93 octane or better you could do 12:1's, custom camshafts from web camshafts and some 50mm throttles. as far as the header(extractors) goes you want something equal length and somewhat longer primaries to keep exhaust pulses close together. im sorry to unload all that info at once.
also with na you dont have the convenience of a turbo to double or triple your displacement capabilities so as the old saying goes no replacement for displacement. if you're looking for something cheap first though and you want to stay with the DE head i'd go for some cams and a little bit of port work. it just so happens my brother projectsunydaze has a set of jwt s3's for sale.