Need Advice From BIG Pig Guys

[duckman1911]

My father in law is a member of our local Kiwanis club. Well they're annual hog (not pig) roast is coming up and some how he volunteered or got volunteered to roast the hog. 150/160lb dressed weight. Now he wants me to help. This is out of my league and most certainly out of his. He is as lost as a chicken with his head cut off.
Its gona be a traditional Louisiana roast. Im thinking 16 hours for something that size. Its been a long time since I roasted a pig and it was a pig not a hog.
Any advice would be greatly appreciated.
If not for dinner being served at a specific time I would just wing it. Dont have that option though.