In my opinion, the only way for a car to be considered for sure one of the approximate 6 would be if it had its born with engine. I believe Duer’s old car is the only one to have both its original engine and POP. As I said in another thread, it is known for there to be more ZI POPs than GM made, with none (I think) having a born with engine to go with them. There were a few of these that were known to have a non-L79 327 original block stamp (ZA I think?). This led some expert(s) to think GM stamped POPs ZI by mistake.
I know this sounds very unusual. Normally, POPs are very reliable, but there is evidence in this case that backs this up. There are other identifiers of a probable true L79 for these cars that I won’t disclose.
Again, in my opinion, could the other cars be true L79s? Yes, they could but without the original engine it could be argued by some that it could be a gamble.
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