I have the chance to buy an 89 toyota with a blown head gasket, here is what I know about the car:

1989 Toyota Pickup SR5
Extended cab, 22re, 2wd
Red ext on grey int

Mileage is unknown to me at this point, its supposed to be relatively clean but I really dont know at this point, I am going to try to look at it tomorrow. Any idea how much I should offer for something like this? Also, worst case money wise what should I expect to get it running again assuming I do the work myself.