Check out this link to "Rio Bravo Reptiles" regarding Island Boas. Scroll to the bottom for some great info (size, etc,) on the Hog Island Boas.
http://www.riobravoreptiles.com/boas_island.htm
If you want a "Pure" Hog, Gus has produced some of the healthiest, well-patterend and beautifully colored Hog Island Boas around. We picked up a female from him about a month ago and she is really a knock-out! I personally enjoy examples which are closer to their natural colors and patterns in contrast to the Hypo Hoggs (to each is own

).
Hope this helps!
Regards,
Rob