Whats it Worth

[Caseys69]

Ive come across a 427 4 bolt block with the casting number of 3935439. Im curious what it may be worth and what i should pay. The suffix code is LP which is for a 69 Vette 427 435 tri power aluminum head motor. Heres the bad part its already .060 and the bore is iffy. Ive included a picture of the stamp. There is a partial vin on it and for whatever reason the owner of the vette doesnt care about buying his original block back...... I know the picture isnt the best to say the least.