I had a HP 383 block, I sold finally and I mean finally for $90. Looking back it was worth that much to simply keep it.
I now have a 68 model 440HP block my ex father in law gave me to get it out of his Chevy dominated garage. I wish I had 70 model HP 440 Block. Who knows, you may get a $100 to $150 for it if your lucky. Problem is unless the buyer is local, its not worth the freight charges to ship it.