if you read him for a draw and that's why you raised the flop, which i wouldn't do without a read because of the ace ("only better hands will call" logic), make it so he has bad pot odds to call, like $3 minimum. your post flop line will win the min and lose the max. my line (not sure this is optimal, but i wouldn't want to play a big pot here) would be call flop, check behind turn, check behind or call a river bet up to around 1/2-2/3 pot.