Near stock 73 Swinger first time at the track

I took my car to the strip tonight for the first time. I’ve never ran the quarter mile before and I wanted to see what it was like and see what my car would do. My car is a 73 Swinger, stock 904 trans and rear end. The engine is an internally stock 318, but with headers, Performer intake and a Holley 600 carb. I got better with every pass, but my best run was only
60’- 2.82 1/8-10.98 1/4-16.670 @ 85.68. I thought I would do better, but I imagine with more practice I can run faster. I was having a hard time getting traction and I felt I had to baby it out of the gates. What are some tips on improving my times or are my times about the best the car will do?