26 inch ECP in a 68 Dart

The problem is most of us dont know Engineered Cooling Products. Or how many rows is in your particular part #. Or if you have aluminum or iron heads. And how much duration your cam has. Does your car have a/c? Auto or stick? Trans cooler? What size fan you running? Was a little vague and needed some info, thats all. Lots of help on here, trust me.
No problem I will try to answer all questions Mopar performance 390 engine not installed yet has RT heads 202 valves Edelbrock Aluminum Intake headers Street Demon carburetor I believe a hundred and eighty degrees on the cam 727 automatic transmission no AC no power steering my first Mopar project but not my first project be glad to answer any other questions by the way the radiator has automatic transmission cooler built in 2 1"tube aluminum radiator please feel free to ask for any more information you need I am tickled to death to get any help I can