that isnt killing you.
Switching to a 4.30 would probably make it trap 250 rpm higher.
Convertor is by far what i would pay attention to first.
It will spin more rpm if you get the car to pick up elsewhere with a good convertor
I agree with everybody- more gear and higher stall converter, your 60 fts. should be in the 1.40s for that E.T. my small block Dart goes 1.49-1.51 60ft. going 11.50 on the stop.