Don't you have enough cars on your plate at the moment!!! How about a compromise? I can get you as many as you like in 1/18 scale....
TC - There's the premier category of V8 Supercars, and then there's the "junior" category called the "Konica V8 Supercar Series" Most of the top level teams also own a franchise in the Konica category, so all of this year's parts are used in next year's Konica cars. Kinda like hand-me-downs...
By the time the majority of these cars reach the classifieds, they have generally done three seasons, had numerous bingles, been tarted up as corporate lap-day cars, been over used and under maintained, and are generally pretty tired.... Do I make it sound attractive?
I wanted to buy NUMEROUS parts when I was building my car (engine, trans, 9" diff parts, suspension, wheels, brakes etc), and about the only thing that wasn't past it's "life" were brake rotors.
It's not like Nascar parts, because the V8 Supercar guys are playing with perhaps 1/10 the budget of a mid running Nascar team. As such, the parts simply have to last longer...
Having said all of that, occasionally a team strikes difficulties and might retract back to a one car team and decide to sell of the second car. These cars are often built by top level teams. You'd save a massive amount by only buying a roller, then fitting a Nascar motor. If you want me to make some enquiries with the Ford teams around here, let me know.
If you want to find out about Holden Commodores (with the Chev motors), you'll have to ask one of the guys that lives in Victoria. It's not that I won't deal in Chev stuff, just that most of the Ford teams are smart enough to have moved up to sunny Queensland
Hope this helps in some way.