$6.50 turbo - early with combo draw

[McDirk]

Pokerstars $6.50 early, 10/20 blinds, no reads. All players have about 1500 in chips.

3 limpers, I limp in the cutoff with Ac7d, button folds, SB completes, BB checks. Pot is 120.

Flop is 6c 5c 4c.

Blinds check, UTG bets 100, folded to me. I raise to 300, other players fold, UTG shoves for 1500.

Thoughts?