Barrett Jackson, what a disappointment

I know its ALWAYS been this way that the SBC is used for EVERYTHING. But if I was that man with lots....LOTS of disposable income- paying a shop to build my car entirely (Checkbook car) why not power that car with a killer 409, Buick Nailhead, 354 Hemi etc. Heck even a 318 Poly is unique and with that huge checking account balance can be made very powerful.