go to pepboys or the local parts stores and ask for a price on a hd radiator... they all sell go-dan/ gdi brand its a large 3 core and works great... used to beable to get them for under 120 but I know they raised there price since so call all three local stores and see who has the best price.
you will need to trim the rubber mounting pads some but for the price you can't beat it
part number should be GDI 433138
heres an atrical ford muscle did on it.
FORDMUSCLE.com webmagazine - Three-core Radiator