As far as porchetta, made one the other day. It's cut from near the pork belly so it has a large fat cap on pork roast. I get it from Sake River Farms. It's a korabuta pig.
They cut it flat, season the heck out of it, roll it into a boneless roast, score the outside and tie it with twine. 8 pounds. Place it on rack in pan, 500 degrees for 30 minutes, lower temp to 325 and cook 2.5 to 3 hours until thermometer reads 150 to 155 depending on how done you want it. Take it out and tent it, let sit fo 25 minutes.
2.5 hours as 325 will probably be perfect but not all ovens work the same.
Fatty on top but crisp, almost like bacon lol, rest of pork amazing. Can use a gravy and or vinegar based dipping on side.
Add some additional seasoning that I get from Cliff winery. Cliff Porchetta seasoning that I rub on exterior. Cliff, same people that make cliff bars lol.