Possible? Maybe. Cost effective? No.
I have run a few N/A motor variations here. I have had a 25D with 22E heads with cams, EL header, 2.25 catless, exhaust, grimmspeed manifold spacers, LW flywheel. While it is a fun motor it's not "fast" it's quick and responsive. Maybe 120-140whp depending on climate.
Currently I am running a 251 with 25D DOHC heads on stock cams. But with the previous mods listed before as well. Also a fun motor with better mid-range and top end. Probably makes about the same WHP numbers but shifted higher into the power range.
Your best bet on 200whp is an EG33 swap with some bolt ons or...a turbo swap. Keep in mine a 2.0L WRX only makes ~170ish whp.