small PP instant call heads up?

was playing a quick heads up match... had this had like fourth hand, reasonably even chip stacks. i didnt think there was any way he had a hand with a 6 in it... what do you guys think? was instant call the right play?

PokerStars Game #5249134085: Tournament #26433486, $5.00+$0.25 Hold'em No Limit - Match Round I, Level I (10/20) - 2006/06/14 - 02:10:13 (ET)
Table '26433486 1' 2-max Seat #2 is the button
Seat 1: kleb (1580 in chips)
Seat 2: goravenclaw1 (1420 in chips)
goravenclaw1: posts small blind 10
kleb: posts big blind 20
*** HOLE CARDS ***
Dealt to goravenclaw1 [4d 4s]
goravenclaw1: raises 60 to 80
kleb: calls 60
*** FLOP *** [2h 6h 3c]
kleb: checks
goravenclaw1: bets 200
kleb: raises 1300 to 1500 and is all-in
goravenclaw1: calls 1140 and is all-in


{read the faq
results dont make a difference and if u cared about getting better, u wont care about wat the turn or river brought.
vqc}

I wouldn't overbet the flop and I wouldn't call the allin.

The fact that it was the 4th hand doesn't justify your thinking that he doesn't have a 6, or 45, etc etc. It is usually fair to assume he doesn't have a 6, but you have no idea how he plays. I have played over 2,500 Heads Up Matches so far this year, and my opponents have ranged from people who call raises with 62os preflop, people who open push the first hand with any A, people who CALL an allin first hand with any A, etc etc. IMO you can find a much better spot to get your money in.

Holy crap GMML - what's your ROI? Maybe you could tutor me cos I feel HU matches against even remotely aware players for me (i.e. I beat most people at $11 SNGs) are -EV.