[Rev]

My opinion is if you want 400 HP from a 289, in streetable form, you will need nitros or a super charger. Either one requires forged pistons and a solid bottom end.

Blue printing is somewhat a variable term. A straight crank bore is necessary. A cylinder bore at right angles to that crank is necessary. A true cylinder bore top to bottom is necessary. Flat block deck surfaces are necessary. Flat head surfaces s are necessary. Proper clearances are necessary as well. I guess it depends on what level of assembly you think is needed for a decent street engine.

Internal balancing is most always needed for an engine 5000-6000 RPM. The truth is that all this costs money. Figure out what you can afford and don't cut corners on the assembly. My $.02.

Rev