Hey Rodney,
Last spring I bought a 3 Row Aluminum Radiator off of E-Bay. The outfit I used was Lead Foot Racing---$200.00 + shipping.
I had to remove and trim the 4 rubber bumpers that help hold the radiator in place because the new rad. was a bit thicker than the stock one.
Getting the fan shroud adjusted just right after it all went back in was tough, too.
Now that its done I'm glad I did it and my '79 runs alot cooler.
Let us know how you do with this.
Kevin