I agree with GTXMatt, your car should be well into the 14's. I ran against a 67 B body at Brainderd this summer with a stock low compression 440 (late 70's), stock intake/manifolds, 3.23's (maybe an RV cam, can't remember what the owner said) and he was running low 15's in 85 degree heat, something's definitely up with yours. As I said my shortbox with a relatively stock 440 (stock intake and tiny factory Holley carb) would blow the tires away with 3.23's (20 mph roll). As said start with a compression check and see where your at