What should i offer on a 79 front end or whole rolling truck????

[treveiger]

I found a 5 lug truck without a motor and trans and the guy wants it gone but says make me a offer. I dont know if hed sell me the front end alone or have to buy the whole truck. What should i offer for the front end if i can or for the whole truck??? What do i all need from the donor truck to do the swap in my 69? Just a general price range would be awesome because im sure he had his own idea of what its worth.
Thanks in advance.