"My Mom's Spaghetti Carbonara"

• Salt
• 2 large eggs and 2 large yolks, room temperature
• 1 ounce (about 1/3 packed cup) grated pecorino Romano, plus additional for serving
• 1 ounce (about 1/3 packed cup) grated Parmesan
• Coarsely ground black pepper
• 1 tablespoon olive oil
• 3 ½ ounces of slab pancetta or bacon, sliced into pieces about 1/4 inch thick by 1/3 inch square
• 12 ounces spaghetti