I'm considering pulling the trigger on a long considered purchase: the rear end of the car is howling pretty loud and spring is coming. I have a 289 with a C4 and a 8" 2.79 open rear. No plans to do anything drastic like an AOD. I want more seat of the pants giddyup - should I go with a 3.0 or a 3.25 posi rear? More of a weekend cruiser type car that becomes a driver when the wife's Jetta is in the shop. Some interstate, some city. Thoughts?