This is what I have. I'm not sure what it fits but it's not the bracket John has. Anyone have an idea? I have 2 of them. They were in a box of junk I got with my last Camaro.
I have in a GM box, exactly the same version of a stop lift kit as you have shown shown stamped #6270739 also.
The original paperwork enclosed with the parts state it is for 1969 Chevrolet 327-250 with Power Steering but doesn't specify Camaro or Nova (although the box does - but that aslo carries the #330265 part number - so I'm assuming it is misboxed).
A friend picked it up at Carlisle years ago for me, assuming it would fit and be neat for my '68 Zed but I run headers and it wouldn't fit obviously anyway even if it was the #330265 version.
Appears from the diagrams that 6270739 attaches to the front exhaust manifold bolt (either left or right side?? of the block) and tucks closely behind the power steering pump if installed on the driver's side... as the enclosed instuctions state "straighten the French lock and remove mainfold bolt. The power steering adjusting bolt may be too long and interfere with the cable bracket - if so replace adjusting bolt"...
Might be able to scan a copy of the paperwork and picture disgram(s) if you feel it is any good to you, just let me know you're email addy if interested... So that is what you have! - Randy