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If it were me....I'd do at least two pigs for 200 people. I like smaller/younger pigs better than one large one, also they are a lot easier to handle.
I usually plan on at least 1/4lb of cooked meat per person...with side dishes.
Here is a 150lb (on the hoof) pig, it fed around 60 people.
Keep in mind, the larger the pig the longer it takes to cook. Most pigs will yield about 50% of the original weight as usable meat, between cookin shrinkage, bone and fat loss. depending upon how many other things you are serving, I would then figure 1/3 to 1/2 lb per person.
thanks for the info, rich if the the bash was going to be here you would be more than welcome, could use some more expert smokers, but this is going to be at my son's in rio rancho nm. not sure of date yet.