[Mgs] Starter Issues?

[frankk12 at verizon.net]

My 1980 LE is giving me starting issues. The battery is fully charged but all
I get is a click when I turn the ignition key to start. I am suspecting the
starter solenoid. I did change the ignition relay only because I keep spares
and it is so simple to do but it didn't make a difference.  I do have one of
those new Hi Torque replacement starters that has been sitting on my parts
shelf for many years. Has anyone here ever made the swap to that starter? Is
it a straighforward swap or are there converision issues to deal with? If I
have to get to the solenoid I might as well replace the starter  while I am at
it. Is that solenoid rebuildable if I decide to keep it original? Sorry about
all the questions and uncertainty.
Frank Krajewski