Don't suppose the tip is jammed in the hole still......please please.
If you can see the remnants of the GP tip blocking the hole.... gently bring that cylinder to TDC.... or ...Did she bring the engine to TDC on that cylinder before removing that GP..... probably not.
If you can get that cylinder to TDC with the tip in place, you may be able to get it out without head removal.
If it is already in the cylinder then I would pull the engine...... remove both heads and have them checked for bad valve guides. You would need a head gasket set, new valley pan etc.....
These engines are much easier to work on removed... real finger jammers and knuckle buster/back strainers trying to remove heads in vehicle. If by back right by the A/C plenum that head is the worst.
The timing mark is found on a little plate that is on the front of the engine on the passenger side. The plate is mounted so it is very close to the main pulley on the lower front of the engine which is mounted on the vibration damper. On the side of the vibration damper, is a line, which when lined up with the line marked (O) on the plate, tells you that the #1 piston is at TDC(top dead center) You can see the line on the damper, and it points to the line on the plate with the (barely visible)O mark on it.You'll have to find a way to turn your engine over by hand. Make sure you remove the power wire to the injection pump(so the engine won't start)and then rotate the engine until you can line up the marks.
The engine rotates in a clockwise direction as seen from the front of the truck, and for every 1/4 turn of the engine(crank) each next piston will arrive at TDC. So, When the line on the vibration damper is at the 2 oclock position, cylinders 2 and 5 will be at TDC. When the mark is at the 5 oclock position, cylinders 7 and 6 will be at TDC, 8 oclock has cylinders 3 and 8 at TDC, and back to 11oclock, 1 and 4 will be at TDC.
Cylinder numbers are assigned 1,3,5,7 on the left (passenger USA) bank from front of truck to back, and 2,4,6,8 on the driver's side (USA), front to back. Firing order is 1,2,7,3,4,5,6,8.