$11: ITM, crazy or solid?

Seat 3: Slidesguy ($8,425 in chips)
Seat 4: Slyfox121 ($3,055 in chips)
Seat 7: Hero [6C,4D] ($3,520 in chips)
ANTES/BLINDS
Slyfox121 posts blind ($200), Reyes37 posts blind ($400).

PRE-FLOP
Slidesguy folds, Slyfox121 calls $200, Reyes37 checks.

FLOP [board cards 8D,5H,4H ]
Slyfox121 checks, Hero bets $800, Slyfox121 calls $800.

TURN [board cards 8D,5H,4H,8S ]
Slyfox121 checks, Hero bets $2,320 and is all-in, Slyfox121 folds.

Put him on a draw because I can't see him check-calling the flop with an 8 or 5. With 2400 in pot I decided I usually have the best hand here, but is this too risky?