Need pro advice Project X Block build Long term project.

yellow rose said
If you aren’t going to boost it, you can either deck the O ring grooves out and use an MLS gasket. Much less crap to deal with that O rings and copper gaskets.

The other option is to clean the grooves out as clear as you can and fill the grooves with JB Weld or similar and then file it flat. I’ve done that in a pinch and at 15:1 and I had no issues with MLS gaskets.

Some guys put a copper wire in the groove and machine it off. I’ve seen it work. Just not my favorite way to do it.
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Actually...you don't have to cut them out OR fill them in. Just use a good MLS gasket, with a bore real close to what the block ends up at. Done it many times, works perfectly. I was told this by a guy who used to work for Keith Black Engines years ago.