First of all there's not "only $8 on the line"
There's 250 odd to be won or lost. Given the money in the pot it is not an instant decision either way.
If you're just going to type "insta call" or "insta fold" without any explanation then why bother replying to the guys question in the first place?
Anyay to try and answer the question,
Surely he has not called such a big raise with 72, 73 or 32 ?
He could have called with 22 33 or 77 hoping to hit a set but then why try to scare you away with such a ridiculous bet?
QQ, JJ or TT - Surely he'd have re-raised you pre-flop?
AA - That makes a bit of sense I suppose. Well pre-flop anyway. His post flop bet doesn't make sense whatever hand he has IMHO.
Flush/Straight draw - maybe something like
giving him a flush draw & inside straight draw.
I'm probably swaying towards calling here to be honest