First Time Out!!
Nice on the first passes. Nothing broke = Good day!
If you have room, try a 1" open spacer under the carb before making any jet changes. Tuning will pick up some more HP and resulting MPH.
Changing launch technique can make a difference in 60' times. May be hard to improve a bunch with a stock converter. If you can mat the pedal without the car killing itself, try launching from an idle and making the converter flash as hard as possible. Load it until it almost pushes through the brakes and everything in between!
Put that thing on a diet. There's a lot of weight that can get trimmed without affecting outward appearance.
Have fun with it.