cam duration

The pertinent info from this post is ; XE268 in at 105.5, 9.6 SCr, and .042Quench, and92 octane. That 105.5 puts the ICA at59.5. So we have every thing the OP asked for
Except what he asked for. So basically another useless post. Common guys.
The OP asked
"for an iron headed small block at about 9.5:1 compression.
..what is the least amount of duration you can get away with
before you have detonation issues."

It's iron headed, 9.6 cr and I have no detonation at 91 or 92 octane...89 yes