Villain is unknown

PokerStars Game #17887843979: Hold'em No Limit ($0.50/$1.00)

Seat 1: Cruznik ($65.07 in chips)
Seat 2: MagnusPoker ($100.86 in chips)
Seat 3: Squeaky_Midget1 ($108.09 in chips)
Seat 4: $_$ 666 Sir ($78 in chips)
Seat 6: MSUITA ($213.02 in chips)
Squeaky_Midget1: posts small blind $0.50
$_$ 666 Sir: posts big blind $1
*** HOLE CARDS ***
Dealt to Squeaky_Midget1 [Ah Kc]
MSUITA: raises $2 to $3
Cruznik: folds
MagnusPoker: folds
Squeaky_Midget1: raises $5 to $8
$_$ 666 Sir: folds
MSUITA: calls $5
*** FLOP *** [Ks 4c Ac]
Squeaky_Midget1: bets $12.50
MSUITA: calls $12.50
*** TURN *** [Ks 4c Ac] [Jc]
Squeaky_Midget1: checks
MSUITA: bets $35
Squeaky_Midget1: hmmmmm?

I think that was probably the worse turn card for me!
I know i'm gonna be stacking off on the river, do I go for the gusto?
What kind of equity do I have in a pot like this if villain had draws that completed on the turn?