l32 uses return less fuel rails, so you need rails off a 02 or earlier GP, as well as L67 injectors, and connectors, map harness. you need a different throttle body because the L32 is electric. also you need to rig up the evap system for the Gen V, its a bit of work but nothing extremely difficult. L67 would be a little easier because of what i just mentioned above with the L32, only advantage i see is the Gen5, better rods, etc. i would go with the L32 and do it up nice cam. Northstar tb etc, i dunno how your budget is