I currently have 2 6x9 speakers in rear deck ,the original 4x10 dash speaker is no longer there. I see two options for a replacments for the 4x10 ,one is two smaller maybe 4 or 5 in. speakers that mounted together in same location ,the other is a 4x10 dual voice coil that also mounts as the original. Any opinions which would give better sound?

i did mine in the doors
http://i1216.photobucket.com/albums/dd379/vfw_1168/29461_396183517018_686457018_4710469_7160875_n.jpg
mine was the same way so i did the 5" speakers in the door panels

What do you currently have for a head unit? (radio)

i went with a new cd player
http://i1216.photobucket.com/albums/dd379/vfw_1168/29461_396183832018_686457018_4710472_4703414_n.jpg

Dave has a sweet 70 RS/SS. ;)
I'm not positive...... but I have a feeling he wants to avoid modifying things any more than absolutely required.

Thank's Terry ,want to keep it all stock appearing (no cutting doors or kick panels). My head unit is a older RCA AM/FM stero 8 track that looks like the stock radio.

Check out there speaker options on the dash speakers.
http://www.customautosound.com/

I modifed the stock front speaker frame and mounted 2 coax. speakers in it....
Covered it with grill cloth and put it back in the dash.

Since your head unit probably has two font channels, this would work for you and be quite simple.

Having the two front speakers so close together is not very good for sound but it's better than no front channels at all.

http://www.nastyz28.com/forum/showthread.php?t=119384

the 140 watt dual voice is what i have installed in my dash, luv it

I have the two front speakers. But I use the fronts as the left channel and the rears as the right. Get good separation that way. And if the radio has a fader but no balance control it gives that option.

I fab'd up a bracket for 2 smaller speakers in mine. It had 2 speakers on condensed cardboard when I got it, so I don't know what stock was for an 80. I like the 2 speakers. The bracket I made is steel, and I put a slight bend to it in the middle so the 2 speakers direct their sound away from each other. They both still point upwards for the most part, but I can hear the difference when I adjust the balance back and forth.

I'm with ya though, I don't like modding the door panels or anything else to fit speakers.

Thank's for the replies guy's. I found these at S/M electro-tech,inc. Spoke to owner (Greg) ,2 4in speakers that will mount in original location using my 4x10 bracket, available in 4 ohm.

http://www.turnswitch.com/