Weird Hand Early in Stars $109/30k

[mkind0516]

We're only a few hands in and IDK anybody at this table. Some may question the pre-flop play, but lets ignore that for now. Check/call on flop is a little scary but I thought I could still be ahead, so I bet the turn. His lead on the river is incredibly sketchy. Is he really leading a big ace here? Could he have been slow-playing a hand like A8, 87, 77, or 88? He def doesn't have Axh since I hold the Ah. What do you put him on?

PokerStars Game #11281967588: Tournament #56616785, $100+$9 Hold'em No Limit - Level I (10/20) - 2007/08/03 - 01:11:30 (ET)
Table '56616785 41' 9-max Seat #4 is the button
Seat 1: luisfran (3070 in chips)
Seat 2: Autavia (3290 in chips)
Seat 3: mkind0516 (3050 in chips)
Seat 4: sally60 (2500 in chips)
Seat 5: lumbardo (3020 in chips)
Seat 6: I_EAGLES_I (3080 in chips)
Seat 7: 777MORTEN (2970 in chips)
Seat 8: boondo (3150 in chips)
Seat 9: stiCKypiFF14 (3040 in chips)
lumbardo: posts small blind 10
I_EAGLES_I: posts big blind 20
*** HOLE CARDS ***
Dealt to mkind0516 [Ah Td]
777MORTEN: folds
boondo: calls 20
stiCKypiFF14: calls 20
luisfran: folds
Autavia: calls 20
mkind0516: raises 130 to 150
sally60: calls 150
lumbardo: folds
I_EAGLES_I: folds
boondo: calls 130
stiCKypiFF14: folds
Autavia: folds
*** FLOP *** [Ad 8s 7h]
boondo: checks
mkind0516: bets 320
sally60: folds
boondo: calls 320
*** TURN *** [Ad 8s 7h] [5h]
boondo: checks
mkind0516: bets 575
boondo: calls 575
*** RIVER *** [Ad 8s 7h 5h] [8h]
boondo: bets 1160
mkind0516: ???