The combustion chamber is fine on your inline.
Some V-8 combustion chambers are worse.
If you have a good quench area,,, you can run more timing.
24-26 total Is about your limit running 93 octane fuel.
I strongly recommend this
http://www.jandssafeguard.com/ it's a little pricey,,,, but it will save your engine & well worth it!
A lot of times you cannot hear detonation until it's too late.
It will automatically retard the cylinder/s that is detonating,or all cylinders,depends on what mode you have it in.
Just need to buy a knock sensor also.
I highly recommend an water/alky injection system also.
MBHD
