I will aim right behind the elbow joint. If you hit just a little farther back you will hit the guts. All of the hogs vitals are tuck in behind their front shoulder. If you get a quartering away shot that is best, but I have and do take broadside shots on them as well.
As far as broadheads, you are going to get a alot of opinions about them. I personally use a 4 blade muzzy on hogs. JMO, but I like a chisel point, three blade or more broadhead for hogs. It has been my experience that with a cut on contact head, I do not get the hole that I get with a chisel head. Also it is my opinion that 3 to 4 blade heads do better on hogs then 2 blade heads. Hogs have a lot of fat, and the 2 blade "slits" seem to not blade as well as a three or four blade hole.
Good luck, and let us know how is goes!
Jeff