A real nice K-Member

Heywodja said
looks like a 67-72 because it has the biscuit type motor mount pads but I am no expert. I think the 73 and up use a through bolt motor mount.

You are almost correct with the exception that it would be from a '68 to '72 A-Body small block V8 car.
The idler arm mount on a '67 is different.
And you are right, the '73 and up used a spool mount K-Member.