The front speakers are an easy swap, " IF " the depth isn't too great. I have Pioneer TS-878's in my dash ( easy replacement ), and they sound great!
But the better part of the question is " what else fits correctly without modifications "? I would have liked to put infinity speakers in my dash however, nobody has mentioned an easy swap with these speakers. They should be a bit difficult to install given the windshield clearance and hole depth, but then?.........who knows?
Let the forum members know if you got them in, and if there were ANY issues. Good luck!, it never hurts to try, and again, you will quickly know if there are going to be issues.
The problem I saw was the cone on the top of the speaker and the cover plate. the pioneer's on the back of the box shows they fit El Camino's but there obsolete now look at Pep boys And Wal Mart They had them. My store still had one set $49.95. They sound great for 60watt and I have a spare set. Good idea to put a suppressor inline so you don't blow them out.:beer: See my video above just click on the picture.