I must say I haven't been able to find a great deal out about this car.
The following comes from the 'site where I found it:
QUOTE
On the catalog published by the ACA in 1968 is a 7-liter Bizzarrini Stradale, classified in the "Transformations". The owner could not stand the mechanical problems of this car, he asked Franco Sbarro, at the very beginning of the ACA, to replace the engine through a mechanical Ford GT40. Sbarro made some luxury development on the inside.
QUOTE
But if it was mechanical problems he wanted to avoid then perhaps the best way wasn't to fit a 7-litre Ford engine. The 4.7 might have been more suitable, but of course less powerful.
Maybe it's been replaced by the Chevy engine again?