Be aware that 500 HP FMS 363 will need a 1" carb spacer to achieve the advertised 500HP. I think they also used a super victor intake. You may need a taller scoop.
Yeah, they used a 1" spacer and Super Victor to get that number. I'm using a 750 Ultra Holley and a RPM Air Gap. According to Car Craft magazine that made more torque lower down. Gives up a little at the top end but I need low end to get out the corners.