I'd say that certainly acceptable for the first time out.

No roll bar, so I don't know how much quicker you can go before they start telling you to slow it down.

As someone who ran well into the 10's with the OE 5/16" line and a mechanical pump, my advice is.... Put a bigger line on it.
With the 383 in my car, I went from the OE 5/16" line/mechanical pump to a cell with a Mallory 140 pump and 1/2" line..... Added a fresh air hood(not sealed to the carb), and took out 100lbs........ And went from 119mph to 123mph.
All I could think of was, "I wish I had done it when I had the 448 in the car".