That first 60 ft is "ALL" important to good ET's . With your gear swap and alittle practice your 60ft should drop to a 1.7x at least. That's a .20 improvement which will equate to a .40 Improvement in your ET. Your 13.7 should drop to a 13.3.
What times and speed was your buddies Nova running ?
Fresh 306, BBK fender mount CAI, 75mm MAF, 70mm throttle, Typhoon intake, Letter cam, ported/polished E7's, BBK equal length shortys, Full exhaust with Flows. T5 swap, 3:55's
Best ET 12.4 @ 108, 1.66 60ft on stock suspension
Track scale - 2745 lbs