Just an opinion like many but if you have a good running car you can drive as it seems you can with the money youd throw at it to still be slow in the big picture even older new style challengers are cheap and the performance options are endless.

But to your current question, wow 3.23 and BFG tires are the perfect smokem combo, when they start to spin they just keep spinning unless you back all the way off.

Knowing now your running a 3.23 gear id say you might be in the high 14 low 15 area, but it sounds like a car you can enjoy alot by just driving it unlike many of us here.