I'm not 100% sure what year these went into production but based on the part number this is a later build 350 (and 231) Power Steering Pump Mounting Bracket. This is the one that would attach to the cylinder head. It's been cleaned, blasted and Painted Chassis Black Part Number 1247873 $20.00 plus exact shipping to your address IF anyone knows the exact year this bracket was in production please let me know! Thanks! I accept Pay Pal and all major Credit Cards. Order by phone by calling (715) 874-6037 Shop Hours Monday - Friday 1 pm to 6 pm Central time. Thanks for Looking, Best Fastener Collection in the country for 1970 - 1972 Buick GS, GSX & Skylark! And Made in the USA. Don't like dealing with the Big Name Retailers? Give me a shout. I'll be happy to help and share 30 + years of experience in Racing & Restoring Buick Muscle Cars. Check out my New Website for 100's of Buick GS, GSX & Skylark Restoration Parts! I now have an OEM Page as well with 100's of parts to be added as time permits! www.Stage1Restoration.com
It actually has 350 & 231 stamped right on it. I'm pretty sure it's for newer 350 & 231 Engines. Maybe Mid to late 70's era???
Mine has that stamped on it as well. I think that was because 455 was not being built when these were made.