Usable or junk??
If it were a hemi K frame or something rare like that it would be worth pulling out. A slant K, should be able to find one for free or close to it. I swapped one out of my 340 sport that was bent the exact same as yours. Same deal, no damage to frame but the LCA was bent to hell.
Did I junk it? Nope. Im probably going to cut the engine mount ears off and convert a slant K.