I just got a 17.4 pound whole shoulder Berkshire swine breed and was wondering how long to cook it to reach 190-200 internal temperature. I'm cooking it as a pernil and will marinade overnight. I want to have it ready for dinner around 7 pm. I was thinking about cooking it in the oven at one hour at 450 degrees and then 8-10 hours at 275 degrees. I was also reading about the Berkshire breed and it has more fat than other pigs so this cut has a lot of marbling. But i figured as long as it got to a temp of near 200 i should be OK. I also prefer slices of pork instead of pulled pork so maybe going to 200 might be too much? Also should i cook covered or uncovered? What do you guys think?