No, you can't convert it to rwd.

There are different motors that come in the b13.

The b13 se-r comes with the sr20de

and the b13 e, xe, and se come with the ga16de.

The fwd sr20det swap is easy as hell to do it just bolts right up and the wiring isn't hard at all. In fact you can even use the stock sr20de ecu.

The se-r is a super fun car and awesome to drive in even its stock form.