V-Tec Heads?

I have a 94 Integra RS with the B18B DOHC non v-tec engine inside. I would like to make it V-tec and all that good stuff, about how much would brandnew v-tec heads cost for my car? Is there anything else I would have to do other than get V-tec heads to make it v-tec? Thx for ur posts