Hi guys,

I'm wondering what situation we can overbet on turn ?
I have one hand that opponent is gutshot combo draw on turn, and hit the river.

Preflop:
UTG limp(103bb), fold, fold, fold, SB open 3bb, Hero have 4d4h (163.4bb)

Flop: Kd4cTc (9bb)
SB Check, Hero bet 6.8bb (75% pot), Villian call, SB fold

Turn: 3d (21.6bb)
Hero bet 19bb, Villian call

River: 5s (59.6bb)
Hero bet 49bb, Villian shove all in 72bb, Hero call, Villian show Ac2c.

I think Villian doesn't have K set & T set because doesn't limp raise preflop,
I consider his range is about two pairs and flush draw so river I bet bigger, and only Ac2c he can win.
How should I bet the turn & river, what size is the best size?

It's my first time to post here, please advise if there is anything unclear, thanks!