M50b20 non vanos power potential

I have a m50b20nv that i want to turbo.

I know 325 is better and stronger but i dont really want to swap yet.

I would like 280-350hp wich mods do you guys recommend for this?

I assume:

Exhaust manifold

Turbo

Intercooler

Upgraded pump and injectors

I believe this is still possible on stock internals?

Exhaust

Upgraded thicker headgasket to lower compression?

What boost do you guys recommend?

Are my hp goals possible?