You made mistake in title. "Are both these two correct?"
28 มีนาคม 2015
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The second sentence is the one which is gramatically correct - ie it has the correct tense - but few people know this, or bother to use it! The first sentence is overwhelmingly more common in spoken language.
28 มีนาคม 2015
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"were" is correct.
Whenever we imagine something we use "were" in this kind of sentences irrespective the subject.
examples--
If he were here.
If they were here.
If Alex were an engineer.
If she were a doctor.