Small block heads with no casting numbers

Well to release some tension I got it torn down tonight. Over all im happy. It has apparently been bored over the walls look good they need some cleaning but overall I will run them without any hesitation. It has the low compression h405cp pistons which im ok with ill run em! I am a little concerned about the bore size vs the piston size the pistons look to small to me. The piston clearance looks very big like you can see the top ring big!?! Im not sure what's going on there. Im gonna have to take some careful measurements and check it out. The cam looks to me like it's never been ran if it has it wasn't much you can see goobs of break-in lube everywhere. They appear to me to be hydraulic lifters. There is alot of crud that needs to be cleaned out. Im not sure if that was knocked in during intake removal or was already there? And lastly the heads. They are small valve 915 heads. I didn't even knew that they made them. @MOPAROFFICIAL was dead on tho! Lol here are the pics enjoy!

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Is that crud on the pistons or are they pitted? Almost looks like that engine had bad detonation