^^^^Agree^^^
When my car had a jlt intake, comp 127300 cams, tune, headers, o/r H and mid mufflers, it only laid down 334 RWHP. figure a 12% drivetrain loss (5 speed manual) and flywheel hp is 374. The % drivetrain loss is an estimate. Also I have 355 gears.
Price estimates via American Muscle...