I paid $500 for a good '60 out of a junkyard. Rock-bottom, any dead engine costs 100-200 bucks. Put on top of that how hard it is to find a decent 261 and the thousands it will cost to build up any old engine, 261, 235, or even 216. Ten years from now you won't remember the couple hundred bucks extra for a 261. I'd offer $200 but I'd be willing to pay up to $700.

-Dan