I have always used the Accel 140001 supercoil, and never a problem. They are huge with lots of
oil cooling. Don't know if they have to be mounted vertical? Most
oil filled coils have a tiny slot near the top edge for the
oil to blow out. Face this away from the engine. We had an old Volvo in the workshop with a tar filled coil. When that blew, hot tar went over everything, then hardened when it cooled. What a mess to clean up.
JD