560 bhp IS achived on the cranck by a cossie engine with a gt30.
and 734bhp IS achived by a gt35 so it is possible
What i“m wondering about is that everybody talk about drivabillity???
Drivabillity and a 500+ cossie engine is long gone, with that much hp you can only make it as good as possible, but drivable, no.