stroker life span?

On the last page I wrote that I average about 5-7k a year. If I knew the stroker wouldnt last that long it would probibly be about 4-5k a year. Streetable to me is simply being able to cruise around a parking lot without the motor "choking" as i look for a parking spot. what if I used the 3.71 in stroker camshaft instead of the 4 in? I think is 3.71 i may be wrong. Wouldnt it put me at 396 with a .03 over bore? That should last longer than a 416 right? You think I could get past 50k miles with that?