$60 for a new head worth it for a few weeks?

I have a d15 in my hatch right now, and it's the CX with 70 HP. Someone has another d15 head that they are selling for $60, they say it's a complete head.
So shouldn't I be able to just pop it on my block? The HP for the head the engine came on was rated at 102, so shouldn't I see at least a 30 HP increase?
So shouldn't I be able to just pop it on my block? The HP for the head the engine came on was rated at 102, so shouldn't I see at least a 30 HP increase?