One OEM General Motors aluminum intake manifold, casting number 458520. The casting date is 8-23-2. With EGR ports and block-offs, I believe this to be correct for 1976-1982 cars, but of course will fit many others. As-removed condition, but I have carefully inspected it and not found any cracks or stripped threads or other problems.
This is my 25th year on eBay. Thanks for looking.