Building a 340 engine

I have read that you should not go more than 0.030 with a 340 block
We got gas with 98 octane
Doubt its the same as what we commonly call 98.
If that's the reasearch octane, might be similar to our 92 or 93. Just guessing.
In US & Canada, maybe Mexico, Octane is the average of Motor Octane and Research Octane. Also called the Anti-Knock Index (AKI)