help with parts value

Need some help. I'm more into ls1's than the old motors now and have some big block stuff I'm looking to sell but don't know what its worth. 454 block standard bore has been line bored, greased and put on a stand. Rectangle port heads kid I got them from said they were gmpp haven't verified. Factory forged 427 tall deck crank and rods. Can anyone give me a rough estimate of what they would be worth?