Ok.... question time again people.

I have looked and used search function(before anyone says anything) but cant find too much (apart from rosscos build thread).
All mods i have mention before for this car are getting installed and 6 speed goes in, at end of Jan.


Now im looking at the new engine build for when the current stock Ver 6 EJ207 goes bang. Car will be looking at 400+ whp with new motor.
Should i ditch the open block EJ207, or find a used semi-closed deck block for my 400whp build?

Is a set of forged H beam rods, pistons and new crank + bearings enough for 400whp? Or will i require more strength?

Looking at a GT 30XXX series turbo for the 400whp.

Also, is cams an absolute necessity for 400whp with a 2L

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STi Ver 6 | 2.1L Stroker | 418whp | 11.5 @ 199kph |

Not fast enough dammit!