Is that what yours came with, there are 2 numbers on top 6 and 5 but they aren't next to each other, does that mean it's a 6.5.
Mick

69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36