Black LS6 4sp Barn Find "Need Advice"

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I looked at a Tuxedo Black on Black LS6 yesterday. In storage 13 years last reg in 81. M-22 4sp, bench seat, real code 19 Chevelle. Extremely rust free original: floors, body panels, doors, cowl flapper hood, 837 alt, 811 WP, Harrison radiator. Looks to have it's original deep grove pulleys and fan, Frame is perfect. Correct tach, Malibu door panel emblems. Checks out to be all numbers matching with the exception of the carb, intake and dist. Docs could be in the car but as it stands "no docs". Pad is stamped T0403CRV, 12 bolt is stamped 0408 hard to read ratio, trans is stamped P0A13C w/vin. The vin on the block is stamped by the oil filter. Is that strange for an 04D built LA car. Seams late to have a vin stamped there.

What do you think it's worth as is and after a frame off and how bad does "no" docs hurt it?

I ask for a couple of reasons. One, I need to know and two, I've been advised that with the vin stamped by the oil filter and no docs the car will never be worth more than a clone and currently only worth the value of it's parts. Do others agree? That got me to thinking, which is never a good thing. If that's the case I find that very disappointing for a couple of reasons. No one could look at this car in it's current condition and doubt for a second that it's the real deal. However after restoration no one will have that degree of certainty. Not to get involved in a discussion about the moral and ethical questions of considering the financial aspects of a car deal but for me that's a fact I have to consider. I was hoping to do a frame off on the car. However, if clone value is all the money for this car that makes it very hard to do. What's a clone worth 40K-45Kmax. With the cost of parts, services + 4-500hrs labor that = a money pit. That would be to bad because this is a real deal black LS6 that needs to be done but It would be hard for anyone to put 65K+ in a car only worth 45K. With all the fake docs floating around, are the docs on a car like this so important that the lack of them kills the value of the car. I want to do this car but......

I've attached a few pics


Thanks in advance for your input
Rick