What radiator?

There has been some good info on this in quite a few past threads. Maybe do a search and I think you'll find that quite a few folks are using one of the universal type aluminum rads from Summit or Jegs. Just make sure the inlet/outlet necks are in the proper position for your particular body/engine. I think ABodyJoe put on in his car not too long ago, so check the search function and see what you can find out there.