My 340 is running hot I think.. I need a sanity check.

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Did you fab up that breather set-up? very nice.
Does that pan fit in the stock K?

Yes. thank you.

It fits the 67-72 k better.

The 73-76 which I run is very close. A added some reinforcements years ago that make it fit really close on the drivers side. If you are putting the motor in from the top, it needs to be motor only no trans connected.