UPDATE: I have identified the car is a Z28 Camaro, not an SS. The 3rd owner swears it was not a Z28, but the documentation previous to him proves it was. Some of the things that threw me off besides him was the Big block radiator, which I found out was made in June, 1970; the clips for two fuel lines- which was on big blocks and the Z28. Erroneously ruling out the Z28, the only other model would have been an SS.
So, the original owners family has provided me with a wealth of information saying it was a Z28, that the original owner ordered. A newspaper article dated in June of 1971 in Eagle Grove, Iowa tells the original owners name, and that it was a Z28 as well.
The second owner was a car dealer in Iowa, who I am guessing did not know that the 69 Z28 Camaros made in California did not have X codes on the trim tag, and therefor was sure it was not a Z28. BUT- the rear end numbers and leaf springs are so very close to the manufacturing date it would be all but impossible to find one to match the manufacturing date of this specific Camaro.
I talked with the second owner's mechanic and body man who converted this Z28 into an SCCA race car, and he explained the damage to the car was sheet metal, and the complete driveline survived the crash and was used to race with. This included the rear end, which had less than 23,000 miles on it. The rear end was rebuilt in the late 1970's and 4.11 gears installed in it along with new clutches. The Camaro only raced a couple events after that and those non original parts are still in it.