i only suffer from gas mileage in the city b/c of the 3k stall. if you want it to be more street friendly i'd suggest going with a trail blazer stall or 2600. i went with a 3k b/c it's only a weekend/strip truck. i went with the 112, it idles rough and when the weather changes (humid, cold, hot, etc...) it wants to die sometimes but it's not agrivating b/c i'm use to it and it doesn't bother me. the 112 should give you better low end torque than the 114 but the 114 will idle better and smother. it's your choice. only thing i did to the heads was put in some comp 918 and some harden pushrods.