Im not too familiar on cams and cranks in v-6 mustangs but I do know you can gain HP just by using crankshafts and other parts out of other ford vehicles, I;ll have to get back to you on that, Heres a list of websites that maybe useful in deciding what kind of mods you want
www.nthcoast.com
www.TheFordSource.com
www.Steeda.com
www.Stangparts.com
www.MustangCollectibles.com
www.CaliforniaMustang.com
Here's a forum:
www.3.8mustangs.com