WAS GETTING READY TO LIST THIS ONE AS 7040250 FOR OLDS 1970 OLDS 350 C.I. BUT WHEN I TOOK IT OUT OF THE BOX FOR PHOTOS, DISCOVERED IT IS ACTUALLY A 7040251! MAJOR COUP LOL!!! I just picked up a dozen rebuilt Rochester Q-Jets and will be listing 10 of them..............keeping 2. These were probably done at least 30 years ago but the gaskets look to still be good and no sign that they have broken down. That being said, THEY WERE REBUILT ABOUT 30 YEARS AGO LOL! I dont know who the rebuilder was but the label is still on the box and judging from it, it was a bigger company. Carb number 7040251 is present and the number shows it fits a 1970 Oldsmobile W/455 engine. WYSIWYG! I will insulate this well and overbox with original box inside. Thanx