[Will]

Originally Posted by 'ol Pinion head

The other thing to think about when installing '67-70 big valve (or converted early small valve heads) on 71+ Pontiac V8's is the earlier heads don't have the top accessory bolt hole, the one for the long alternator bolt on '71+ 10SI (37-63 amp) ALT/PS setups. Have detailed before how several times I've taken the entire common style '71+ Alt brackets & loaded PS setup, & trimmed down by a few the threads, the threads on the long alt bolt, then flipped that bolt around backwards. End up using a plastic insert style locking nut at the front pivot hole where the end of the long alt bolt comes through. Little cumbersome to do by yourself in a car (use the cherry picker & a thin fabric ratchet strap if you don't have help), but the flipped bolt trick works well for solving this issue.

That's a good solution! Welding a nut to the back of the alternator bracket has also been proposed. That's the route I went, worked fine.