cwestra,
Proliance (used to be Modine) makes a brass replacement radiator with stamped tanks. It looks pretty close to original but obviously doesn't have the Mopar part number stamped on the upper tank.
Here are the specs taken from the website:
Part Number 433619
Make CHRYSLER
Construction Copper Brass
Core Size 17 1/2 x 26 1/4 x 2
Number Of Rows 3
Mount Type Flange
Inlet Location Top Left
Hose Inlet Size 1 1/2
Outlet 1 3/4 Outlet
Location Bottom Right
Tank Inlet Size 3 X 26 3/4
Tank Outlet Size 3 X 26 3/4
Transmission Oil Cooler 10
Make Interchange Part Proliance Part
CHRYSLER 2998948 433619
CHRYSLER 2998949 433619
CHRYSLER 2998974 433619
CHRYSLER 3443969 433619
CHRYSLER 3443970 433619
CHRYSLER 3443971 433619
CHRYSLER 3574624 433619
CHRYSLER 3574626 433619
CHRYSLER 3574627 433619
CHRYSLER 3673027 433619
CHRYSLER 3673924 433619
CHRYSLER 3673927 433619
DPI 374 433619
SPI 374 433619
Make Model Years
DODGE CHALLENGER 1970-1973
DODGE CHARGER 1970-1973
DODGE CORONET 1970, 1972-1973
PLYMOUTH BARRACUDA 1970-1973
PLYMOUTH CUDA 1970-1973
PLYMOUTH ROADRUNNER 1972-1973
I have one in my 73 Cuda 340 and it does a good job cooling my motor.
Hope this helps.