You'll be disappointed at the lack of hemispherical combustion chambers.
Dion, is a 5.2 or 5.9 Magnum engine available in NZ? They came in mid 90's to I think 2002 or 3 trucks, vans, Durnago and Jeep Cherokee. None of the "modern" mopar systems are that great performance modification wise until the Gen III Hemi (another Option.....?)