If you are going to keep it at 300-350whp then this is all you need.

Forged rods and pistons (leave head and intake manifold alone)
Headstuds
Good turbo kit (not ebay, large GT28 or T3/hifi 60)
Good clutch
LSD for tranny (B16 gears are just as strong as all other bseries, diffs are weak though)
Good tune.

Sleeves will be fine if motor is built right and good tune.