Guess ET for 318 ? With slicks ???

I thing your 60" time should be better and i thing a smaller carb would help that out....could be wrong but ........

2nt, You said in a earlier post that when it shifted into 2nt gear, that it shifted really hard.........If your motor has ran out of breath and is not pulling as hard.........the shift will fill harder as you have been loosened from you seat, by the time the shift has happened.........Kind of like shooting a shot gun when you don't have it firmly too your sholder......It kick Harder!
TEST IT, shift into 2nt at 6200 and see how it fills and how what the et is. Then shift at 5800 and see if your seat of the pants feels the same as the et it produces.
Try it, prove it to you self.
Try a 600/650 carb:burnout: