Having the A
, J
or 9
is pretty important here ... not so much against fish who are calling A432 pre. and on this flop, but certainly as you move up (and it'll help you balance calls vs. folds with the same hands).
You should also be checking (and then raising) this turn, for a whole bunch of range and hand strength reasons ... but it'll also help because if it checks through and you check river (or even bet ½ pot) it's more likely villain isn't bluffing when bets or raises happen.
Also, pre. is a fold with no suits (although you might be able to get away with it at his level).