Conversions & Hybrids - Engine and tranny swap price

What does an engine and tranny swap cost in a firebird v6.I ask because i am gonna swap for a guy and i want to give him a fair price?

I'd like to find this out too, I am currently short of time and facilities to do an LS conversion for my 73 bird, and would love to find a decent shop in NW Wa that I could trust..