Was thinking of putting my 8s in the sail panels and putting two 10s in the hatch area with two 4" in the dash. The 4s and 8s will run off a four channel amp and the 10s off a mono amp. How well or easy would this be to pull off?

 

Yes. 8s will fit and you can use the stock 6x9 brackets to do it (with some modifications).
Here's a link to some pics with descriptions on my motortopia site:
http://www.motortopia.com/cars/1984-...ailpanels-5330

 

But do they sound any good mounted that way?

 

the only issue I noticed was the black vent in the door jamb rattled a little after the install. it would probably be better to build some kind of fiberglass enclosure in there to make a "sub box", but I never got that ambitious.

 

make sure you use some sort of sound deadening material behind speaker to reduce vibration sound. ive got 6s in mine and the rattle was very annoying