BTN: $145.22 (290.4 bb)
SB: $54.74 (109.5 bb)
BB: $171.03 (342.1 bb)
UTG: $60.09 (120.2 bb)
Hero (MP): $145.12 (290.2 bb)
CO: $62.71 (125.4 bb)

Preflop: Hero is MP with Td Js Ah Ac
UTG folds, Hero raises to $1.50, CO folds, BTN calls $1.50, SB calls $1.25, BB calls $1

Flop: ($6) 6c Kd 5c (4 players)
SB checks, BB checks, Hero ?????

I have an overpair + nutflush blocker, bet or check? If bet, sizing?