I'm at $20500, but I'd be at 604 cubic inches and would make about 750-775 hp on pump gas, with a hydraulic roller. Would peak the horsepower at around 6000. Very mild.
Ford Motorsports block, Scat crankshaft, Callies rods, Trick Flow A460 heads, etc, etc. High quality stuff.
Complete engine from
oil pan to Quick Fuel Dominator carburetor. All pulleys, brackets, alternator, starter, and a pack of adult diapers.
Obviously, less expensive engines are available. I could build a 630 hp 385 series engine for probably around the $14000-15000 mark.