Blown head gasket

hwy2 said
Seems I blew a head gasket. Loosening head bolt I noticed two close to the break in gasket were looser than the others. My set up has 11:1 compression with .039 compressed head gasket. I have cometic but they are .020 and will raise compression to 11.6:1. I have aluminum heads. Will this be an issue with 93 octane. It’s a 318/392 thumper cam. .513 lift intake
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A small block Mopar has 4 bolts per cylinder to a small block Chevy "s 5 per cylinder. It has less clamping force. I blew a few on my race car. The fix was to stud the block and use Fel Pro O ring head gaskets. The standard Fel Pro does not have a Oring in it.