To run mid 13s at ~3200# you'll need about 240-260RWHP. Math302HO dynoed at 240HP, has a 3100# 87 notch 5spd with the stock cam retarded 4°, ported E7 heads, long tubes, 3:73 gears, slicks, my lower and he ran 12.7@107. Rio5.0 dynoed at 255RWHP, has a 3650# 95 GT with 65mm TB, 77mm MAF, stock intake with my lower, long tubes, Thumper stage II heads, Steeda #19 cam, pulleys, 3:73s and ran 13.7@100mph. Mid 13s should not be a problem with decent tuning.