Live MTT $120 entry, 40 entries.
5 players remaining
5th place = $400
1st place = $1600

Blinds: 8k/16k

Stacks:
UTG: 80,000
CO:(HERO): 240,000
BU: 80,000
SB: 210,000
BB: 190,000

UTG folds
Hero raises to 40,000 with AcKd
BU Fold, SB Fold
BB calls 40,000

Flop: 3h 7c Kc

BB checks
Hero bets 50,000
BB shoves

Hero?

BB had been known to get out of line a bit and had gotten to showdown with marginal hands in the past (had been seated with him since we were down to 2 tables). Hero had just doubled into the chip lead to burst the money bubble, and has a tight table image and would be viewed as playing conservatively though in reality I was just really card dead for most of final table to this point.

Do I call it off here with TPTK putting me in a goot spot to ship the tournament if I win the hand, or fold and try to ladder up a couple spots before i get it in?