406 BB shortblock

how much power should this engine make? is everything new or used?

The engine made about 600 hp with the ported Edelbrock heads and a Victor 383 intake. The customer ran the engine for a year in a street driven Duster then decided to make some changes. The engine was freshened up but the guy ran into money problems and the engine hasn't been started since then. Some parts are new, some are used but the shortblock is ready to fire.