I know of the 520 but not familiar. When I built mine in the 1990’s I went with the 555. I don’t think there are many much faster than you and I can’t imagine driving a Dodge Omni over 120 mph!! My times were nowhere near that. There is one guy, forget his name that broke into the 9’s with a manual tranny in a glht omni at 35+ psi boost!!
