If Nolva is all you've got, its certainly better than nothing. Nolva and Clomid handle the post-cycle crash from two different directions...
Nolva: Has its greatest effect on the Estrogen receptors within(muscle)tissues. Following AAS use, your Estrogen levels are sky-high. The Nolva will keep your hardness from going to pure bloat.
Clomid: Has its greatest effect on the Pituitary gland. It gets your balls going again. Depending on what kind of sauce you've been on(and for how long), you're probably going to need some Clomid.
Do a search for the optimum Comid dose to get your boys running again. I run Clomid/Nolva/HCG post cycle and have had great success.