Slightly quartering away, with the foreleg forward, shootem in the armpit. The heart is 3 inches from the skin in the armpit.
The heart is the size of a yellow apple, on big huge hogs(#300-#500) are bout the size of a red apple.
You can not shoot too low on a hog! too low is a miss !!!!
The heart lays directly between the front legs and on the breastbone. When the hog is standing feeding the heart does not extend back past the front leg.
All the vitals are low (read..real low) and forward.
A whitetail shot is liver hit at best and that is tight behind the shoulder in the crease, any further back is gut shot, any higher you miss all vital organs.
They probably won't let you use mechanical on hogs at the ranch.(check with the owner to see if they are allowed) a cut on contact Broadhead is better.
2 or 3 blade is your preference, but 2 blade cut on contact head penetrates better, a 3 blade head Like a Snuffer leaves a better hole.
Hogs are humbling creatures, they are constantly moving and hard to kill, and they are built like tanks.
Have a good bowhunt