What are these brackets for?

[Righty Tighty]

Under the hood, one on each side. '74 Barracuda.

 

[terrywalker]

I would say an A/C condenser if the car had A/C at one time.
Terry W.

 

[Righty Tighty]

That makes sense! The car was indeed an AC car. Thank you.

 

[moparmarks]

Yep, condenser

 

[Rons340]

This is the best image of the condenser mounting I could locate on short notice.