Just a side note, Why didn't you top off to $500 before the hand? You would have then had the villain covered.
Preflop, im not sure you can count out A4 suited, and if you give him that then A3
and A2
for a combo draw, and any other Ax
is also in his range. If you cant give him 46, you cant give him 35 either.
That being said, With $50 in pre, your Pot-sized flop raise is fine. Now with ur read is that he cant have 2 pair and would have raised a set on a super wet board, I'm getting it in here on the turn. You have a STP Ratio of only a half, so hes calling you with any OP and any FD.
If your read is wrong and he did flop a straight, a higher 2 pair, or a set, oh well, time to reload.