yeah,
by the time you have evrything off the engine it is not that much more work to just unbolt it from the tranny and take it out. i tryed to do it on my 83 wagon keeping the motor in and could of done so but since i was that far my throw out bearing needed to be replaced so i took it all the way out.
if you keep it in you will need to unbolt the engine from the cross member and pry it up and to the side a little (i used a broken hockey stick) as well as loosening the tranny mount bolts to pull one of the heads off. i forget which side but it's the one that sits further back, twords the firewall, than the other.
Also, very important, before you start read and make this:
http://pub110.ezboard.com/fultimatesubarumessageboardsfrm7.showMessage?topicID=136.topic
will save you a lot of hassle if you have this before you start. forget all of this though if you have the special subaru socket.
don't worry yo, with a torque wrench and a little time it's a peice of cake on the EA-81's.