You should be right on the 13's. I was running 14.0's with just D.O.T's & underdrives when I first got the car & wasn't as good of a driver. Don't forget to ice the day lites out of the intake & take out anything that will come out easy to keep the car lite. We also put a GT in the 13's with an off road pipe, race pulleys & D.O.T's and a 240 lb. driver. You just have to dirve it like you hate it & figure out the shift point your car likes best. I would recomend getting the heads & intake from an '87 & later. What you've got, a 3.73 gear & later induction should go 13.6's -13.7's all day.
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