Josh I have Installed A block heater in My 80-300td.It was a
*****.If I remember the block heater is brass.That should make it much easier to remove.I removed the manifold and layed it back.I soaked it with penatrating fluid for a few days.I had to remove the manifold so I could get a staight shot,at it.A long peice of pipe on the end of the wrench.And it broke free.Brass is soft make sure you have a high quality wrench.To use a socket you will have t0 cut the lead off at the element.This is really not as bad as it sounds Good luck.