I'm wondering what you consider high compression? What is the compression ratio? Have you ever checked the compression pressure with a gauge?Any thoughts on 87 octane with a high compression chamber? Anyone ever run into issues with performance ?
I think Al's question still stands bhill. Slim chance that someone with your mods has milled their head to your exact measurements and tried it on 87 octane.
As al stated need to know the static compression ratio to get an idea if your close to needing a higher octane to avoid detonation.
That's odd , one would think that someone would try to get alas much compression as possible , I think it creates H.P. ( horsepower )
What does that have to do with what I said at all? Your asking for help and were trying to get more info from you so we can help you. Nothing in my reply was geared towards why you would or would not want to increase compression. Obviously you already have if you have milled the head. A smart @$$ attitude isn't going to get you much help from anyone here.
Good luck