Another overheating situation 63 Slant six

Sorry folks for not replying earlier but I spent the last week plus up in the Cascade mountains hiding out.
I've included a few pictures regarding some questions here.
First shows the location of the temp sensor.
Second shows how the one on the left is biased in towards the engine.
Third is another one of how the core of the radiator on the left is much closer to the engine that the original on the right.

dart-radiator-temp-sensor.jpg

dart-radiator-bias-diff.2.jpg

dart-radiator-bias-diff.jpg