The HG is only obvious if the engine is pristine and spotless and you know well what a MHG looks like in profile... if it was replaced with a composite HG, there's no way to tell that's practical.
The OEM headbolts are hex head (allen) bolts, they require an allen key to remove them. ARP fasteners are all 12 point nuts. Some off brand aftermarket fasteners I've seen were six point bolts.... Oh, and then there's the TINY print which says ARP, IIRC.
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