Sorry for the delay, tried to post this yesterday but had computer problems and couldn't the phone/camera and the computer to cooperate with each other. It’s easy enough to make your own pre-oiler tool for priming the system on these cars.
With the oil pump drive being a shaft with bladed end, a slotted shaft to fit the oil pump drive, a flexible coupling and another shaft to fit a drill motor will do the trick. You will need the following:
1/2” rod stock about 7” long
1/2” heater hose about 3 ½” long
1/2” or 3/8” rod stock about 6” long
Hose clamps
Tape to wrap 3/8” rod stock if using that size
Reversible 3/8” or 1/2” drill
To fabricate pre-oiler tool:
Slot one end of the ½ rod stock ¼” wide and ~7/16” deep with a rounded bottom
Insert non-slotted end into heater hose about 1 ½” and clamp in place
If using 1/2” rod stock, insert into other end of heater hose about 1 1/2" and clamp in place. If using 3/8” rod stock, wrap with tape to increase diameter close to 1/2”, insert into heater hose about 1/12” and clamp in place.
To use:
Attach tool to drill and set drill to run anti-clockwise.
Remove valve cover
Oil the slotted shaft and fit slotted end of tool onto the oil pump drive blade and run drill anti-clockwise, wait for oil to appear in the valve train and start to drain down back into the lower portion of the engine. If it starts to get too messy, you can refit the valve cover.