This is not easy to find. In the center of the cemetery, Lot 5, Group 281. You can get a map from the office, there is a computer kiosk at the entrance you can search for graves on.
Howard is interned with the Phillips family monument along with his mother and father. The donated gravestone with his name alone on it, is not his actual burial spot.
More specific directions are here: http://quahog.org/attractions/index.php?id=3over 2 years ago