451 overheating, even when moving

The lines were both for the transmission so I clamped them and removed them from the rad, I'll splice them together with a barbed fitting. Out from the trans, into the rad, out from the rad, into the cooler, then back out to the trans.

I repurposed the original shroud to mount the pusher fan, just need to wait for the spacer to show up and I'll put it back together.

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Will a 3/8 plug close those holes in the bottom of the rad?