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Not sure which one is the '67, donor or receiver; however, I believe that the radiators changed from vertical flow to cross flow ~ '66-'67, so the tanks would be oriented completely different.
 

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My 65 is horizontal not vertical
If you have a factory type radiator, you have a tank at the top and one at the bottom. The water flows "vertically" from top to bottom. The later "cross flow" radiators have a tank on the left and right sides of the radiator and the water flows "horizontally" from left to right.
 

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Keep us posted! Do the ST300 lines not fit? 67 GTO was TH400, and I’m not sure if TH350 and TH400 used the same lines. I’m planning to swap a TH350 into a 67 Lemans, so I’ve got the same questions.
 
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