To my understanding...
Clomid- Brings Test levels back to normal after steroid cycle and maintains your gains as far as mass and strength.
Nolva- A bit confused, but as far as i know it destroys estrogen levels that could cause you to get bitch tits and other lady like attributes.
So after SD it seems both would be pretty nessecary for PCT, but i guess im wondering can i get by with Clomid only.