[TomG]

You need to make a play at the pot, IMO. Raising the turn is good because it gives you the ability to...

1) Win the pot outright
2) Promo raise your pair of 8's increasing your chance of getting 3/4'ers from another A3
3) Get it all-in against two high hands

All 3 are possible and all are positive results from raising. There is a benefit to smooth calling the turn to setup a river bluff. The smooth call disguises your hand and keeps the pot small. Then if the board pairs or flushes on the river, you can rep the made hand. This form of a bluff may scare a high hand into folding that would have otherwise called your turn raise, felt committed at the river, and split the pot. This also has the added benefit of allowing you to slam your fist down, yell your favorite expletive, and consider folding if you get counterfeited on the river.