Build 400HP 318

I'm going to build a 318 for my sons 74 Dart. We would like to get about 400hp out of it but still have it be dependable, so he can drive it 3 or 4 time a week.

has anyone built one and if so please tell we your experience and what you did to achieve it. Bore, stroke, cam, pistons, carb and all.

Thanks