318 value

I recently found a 318, year, condition is unknown by the individual who has it. What makes it tempting is that it has a 340 intake manifold on it. It's complete except for the carburetor and distributor. The owner said make me a offer, but honestly I have no idea what to offer him. I don't think that he'll let me pull the oil pan either
Have ever owned a 318 ?
What's the obsession ?
Have no problem with you wanting to do a 318, just people usually are doing them cause their car has one or they got one sitting around which you don't seem to have neither.

As for the 318 a couple hundred.