I'm not folding an overpair here against an aggressive fish. It's just not happening.
Anyone has random stuff in their range at every point in any hand, a 60/38 has a huge amount of random stuff (especially on the flop) which is why we have to call. I believe he does this with flush draws, with ATC on random spazzy reads and feelings, with top pair and with nut hands.
Giving him a range seems a futile exercise but giving him QQ,88,55,Q8 as a value range (Q8 and Q5 both only show up some of the time, I just used Q8 to represent both), assuming he does this just with AK and KQ that we beat, we have to call (it's almost exactly a coinflip). The weak part of his range is way wider than that.
everyone who just told you to call is basically a losing player. Pokerkid will tell you that himself.
I exagerate my suckiness.