1970 Chevelle LS6......need your opinions

[Mr70]

It does look like it's been rode hard & put away wet,but don't be so quick to dismiss it.
From the few photos you've posted,it's showing many questionable & incorrect parts like Master Cyl,Transmission,shifter,no tail pipe hangers,Blue over spray on body bushings,Ex.Manifolds etc.
Try to look past all that & at it's true heritage.
Your LS-6 tach description sounded good.
It's holding an LS-6 specific 4:10.
The correct PA radiator too.What's the part # on the fan shroud?
What's the part # and date on the fan blades,If not,look on the fans center hub for any markings.
I have a few Arlington Tx assembled 1970 Chevelles with Special order paint in my database.
Three are special order Hugger/Monaco Orange Acrylic.Their May/June buildsheets back this up.
Two have the CON VIN before the Tona date too.
It's transmission stamping was obviously added by someone later on,and looks like the wrong VIN font to me compared to the engine pad,from the pic you posted.That's not really an issue w/me,cause it's clearly not the one it was born with already,and some repair shops would stamp the vehicles digits in them when replacing,for their warranty purposes.

Get the casting number & date code off the back of the block.
Get the casting numbers & dates off the heads.
Get the casting number & date off the waterpump.
Get the casting number off the intake manifold.
Get the casting number & date off the Distributor.
Get the casting number & date off the Holley.
Get the casting number & date off the starter motor.
Get the casting number & date off the alternator.
Deep groove pulleys all around?
Is it holding an 8" dampener and correct tab timing cover?..If so,what's the date on it?
And clean the trim tag off....just to name a few.

Hunt for a buildsheet,some did get them and don't forget the sound deadner.Arlington liked to place em under the sound deadner.
Try to do a title search in AZ. to discover the past mileage.
Find out where he got the car from,contact the people he got it from.Ask what it was like when they owned it.Ask for pics too.

It's not easy to document and find a correct car,thus why they are so sought after today.

[Hawkeye]

Thank you for all the opinions, suggestions and knowledge. It has all been very helpful. If or when I get any additional information I will keep you all posted.

Thank you,
Marty

[resto4u]

Marty how much are they asking for the car? Explain to the seller that it is an undocumented car and that there are some incorrect parts and some issues with the engine and trans stamp. Offer them less than market value of a documented car, and if you can document the car later after you own it, good for you!