I may have been told bullshit. But my mate was working on a 33 with 385kw at the rears. was running 25psi, threw 2 conrods through the block the size of a fist, tore the engine mounts aswell.
Cant remember details, but was fairly hardcore., high mount, ase plenum, EMS stinger, coils, Injectors and the shit. Internally stock apart from cams.