how much for 65 comet?

[89LXCarb]

I have a chance to buy a 1965 mercury comet with a dual quad 302 a 4 speed toploader and a 9 inch rear with 411's. It is rusty, but not so much that the car is hopeless. It will need some attention, though. I know for sure that the dual holley's need rebuilt and the person who rebuilt the motor was an idiot so I'm sure the motor needs a total rebuild. He is asking $1500. I think I can get the car for $1000 or less. What do you guys think it's worth?

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4 cyl converted to V8
306 auto 512" lift cam edelbrock intake holley dp carb ported gt40 heads 373's 4 wheels discs
1/4 mile times commming soon
hoping for high 12's