400 stock stroke, stock style forged pistons, blueprinted compression to 7.7:1, mildly ported iron heads with 2.14 1.81 valves 240 @ .050 cam ground on a 112 and a 6-71 on top over driven at 5%. There's your 600HP recipe.
Well hopefully Brooks will go for that.
That's twice as expensive as a naturally aspirated 600 HP stock stroke 400.
Nearly $7k just for the blower, manifold, belts and pulley. A person could put ebay junk turbos on a stock stroke 400 for under 2500.