Sorry for a lengthy posting but here's a couple thoughts...
Reading this thread reminded me of my days in the car business and how our dealership had another separate 'holding company' we would often 'sell' the vehicle to even though it didn't move from it's spot on the lot. . This was done so the dealership could take advantage of manufacturer incentives offered for reaching total number of certain models or grand totals of all units 'sold' in specific time periods...also sometimes for specific tax and accounting reasons too. .
In our case anyway, when the car was actually sold to the end user/customer, the paperwork was the same dealership stuff but one key thing differed...the 'in service date'. . This is the date the manufacturer considers the vehicle sold and the warranty begins ticking away...even though the vehicle still sits on the lot as a new car. . This date thing was seldom mentioned to the customer, hopefully never noticed by anyone and was occasionally a problem if the customer had a legit warranty concern and the manufacturer's warranty had actually just run out. . These cars and other vehicles 'with issues' were on our own lists to recognise the situations and 'warranty' was often covered internally as we didn't want customers to know what was going on. .
As much as I understand, this practice is totally legal and a common situation among car dealers also I don't think things are any different today? .
When buying cars I am still careful to check and clarify with dealerships what the 'In Service/Warranty Date' is! .
This whole blurb is not to say Yenko could have been doing anything crooked but to consider how and why Yenko Chevy could've 'sold' the units to Yenko SC before they were actually needed for conversions...it could be a similar situation where Yenko Chevy could meet sales goals, gain manufacturer incentives or take advantage of tax situations also a place to land vehicles w/ issues? .
If one of these vehicles happened to be sold to a customer before a conversion was ever done but after being passed on to YSC, it would have been on the YSC list, unmodified but with different warranty coverage? .
~ Pete