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Yeah, that all looks like it is localized to that post and nut. Maybe it was slightly loose, generating enough heat to start melting the block which made it even more loose and more heat.
Replace that block, the Edlebrock terminal, (OEM one may be OK but that's your call) Clean all of the contact surfaces and tighten everything back down. Start the car and monitor the temp of that connector with your finger or a temp gun if you have one, it should not get hot at all.
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