Monster draw. Correct play?

[bdawg56kg]

Early in a 10+ 1 rebuy + 1 addon. In a cash game I'd love to be all in here, but keep in mind I have a big stack. Should I not want to risk it here? Villian seems solid. Nothing out of line so far.

PokerStars Game #3941209954: Tournament #19225109, Hold'em No Limit - Level II (15/30) - 2006/02/11 - 20:50:23 (ET)
Table '19225109 21' Seat #2 is the button
Seat 1: Willie Horn (2975 in chips)
Seat 2: dolohov (6240 in chips)
Seat 3: bigbrains (3415 in chips)
Seat 4: bdawg56kg (6570 in chips)
Seat 5: C. Orange (4780 in chips)
Seat 6: phattchumpy (4670 in chips)
Seat 7: unique1c111 (1160 in chips)
Seat 8: roddy11 (2160 in chips)
Seat 9: lamb34 (2610 in chips)
bigbrains: posts small blind 15
bdawg56kg: posts big blind 30
*** HOLE CARDS ***
Dealt to bdawg56kg [8c 7c]
C. Orange: folds
phattchumpy: folds
unique1c111: folds
roddy11: folds
lamb34: calls 30
Willie Horn: folds
dolohov: folds
bigbrains: folds
bdawg56kg: checks
*** FLOP *** [Kd 5c 6c]
bdawg56kg: bets 90
lamb34: raises 90 to 180
bdawg56kg: raises 820 to 1000
lamb34: raises 1580 to 2580 and is all-in
bdawg56kg: calls 1580

[Sprayed]

I'm calling. You have way too many outs.

[Jimmy Mac]

Board: Kd 6c 5c
Dead:

equity (%) win (%) tie (%)
Hand 1: 50.8794 % 50.88% 00.00% { 8c7c }
Hand 2: 49.1206 % 49.12% 00.00% { KK+, 66-55, AKs, KJs+, AKo, KJo+ }

Looks good, I'm not sure about that range though. His play seems like a 55 or 66, but in a rebuy he could have all sorts of stuff.

edit - you are 42% even if he has a set. Easy call.