im thinking of rebuilding my 4x4 cossie engine in the winter looking for 450 + bhp what work would be required to the bottom end to make this a realible and strong unit also wat sort of management are people using as u hear so many different storys as to wats good and wats not also a bit confused to wat injectors to use some say greys some say to go with siemens units will be using a t38 any info would be great