Just keep in mind that through 68 and back was an 8-bolt timing chain cover and 69 and up went to the 11 bolt. It's been my experience that a lot of 68 and older Pontiacs have been switched over to the later 11-bolt type as they have been more common.

So basically double check your timing chain cover and order accordingly. In addition, the pulleys were also different and I have seen many 68 and older Pontiacs with 8-bolt timing chain covers but then had 69 and newer pulleys. This stuff over the years gets mixed up and the problem is pulley allignment.

I went through hell to round up all the correct pulleys, an 8-bolt timing cover etc. just prior to the car being totaled. LOL However, I now know what to look for etc. It sure makes a difference when you have all the correct parts. Pulleys line up, so you don't throw belts, water pump spins at the correct RPMs etc. etc.