Have 90 Mustang GT 5.0, stock bottom end, 1.6 RR, GT40 iron heads, GT40 explorer intake, x303 cam, longtube headers, 3" exhaust with turndowns at rear axle, 5 speed manual, 4.10 gears, only thing unsure is on Mass air size, throttle body size and fuel injector size, right now all that is stock