I believe this is a later V6 cover with a cast timing tab that can be used on the 350s as well. All bolt holes are excellent. $100 shipped from Clarks Summit PA 18411
Hi Louie It appears after my machinist looked at the photos that it wont work on my turbo buick. I will have to pass. Thanks Herb
Timing cover arrived today and it's the same as the one on my GN engine with the exception of the timing tab. I'm pleased with the part. thank you