89 GL --more info please?

i just picked up a 89 subaru GL sedan and want to get some information on it..
anyone here know about these?

car has some rust 218k on the ODO
tranny (auto) seams to be pretty jerky
and has low Oil pressure once warmed up and ideling
as well as a lifter tick

i am looking for info on the motor
possible swap information
as well as interchangeable bady parts list as well as the rest of the parts

thanks in advance for the help