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John is feeling well.
John is feeling good.
"well" is an adverb and "good" is an adjective.
Is #2 grammatically correct at all or is it ok to construct Subject + Linking Verb + Adjective where adjective is describing the subject?
If #2 is grammatical, what is the difference between the two sentences?
Subject + Linking Verb + Adjective is absolutely ok. It even has a name: Predicate Adjective. Both sentences fit that structure, actually. well is used here in its adjectival sense. One of the meanings of the adjective form of well is good, but it more commonly means healthy.
You seem to not know a fundamental fact: good is an adverb, as well as an adjective.
So both of your clauses are grammatically perfect. And technically, there's no difference between them. However, colloquialism interferes with everything in languages - which brings me to the point that "good", in this sense, should mean "happy, ready, ebullient", whereas "well" should mean "healthy".
