1991 Toronado crossed plug wires

I have recently had a valve job done on my 1991 olds toronado trofeo 3.8L with about 160,000 miles. The valve job was due to the catalitic converter stopping up and causing low compression in two cylinders. Now it has a bad misfire and the repair guy thinks the plug wires are crossed. The problem is the repair manual shows a one piece coil pack for this car and mine has three coil packs on it. Can you tell me which coil goes to what plug please?