A more realistic goal would be about 170whp or so. Any more and you start to lose reliability. If you have tons of money to blow, then go for it. I would suggest going with a B20 block, P&P head, higher compression pistons (at least 11.5:1), eagle rods, crower stage 3 cams, crower valve springs and retainers, a good intake manifold and throttle body, a good header, and most importantly a good tune. That should put you close to 190-200whp. Those cams would not be very street friendly, but if you want that much power (N/A), you have to sacrifice streetability.

If you are looking for more N/A power, or a cheaper way to make N/A power, go VTEC.

If you want the cheapest power, you just need a basic low boost turbo setup. That would be the easiest way to make over 200whp with a LS.