I just got a 283 for 500 from a friend who replaced it with a 406...i am going to put a holley 600 and edelbrock performer rpm on it to replace the 2 barrel setup...this is all going into a 79 280zx...i was wondering if anyone out there could tell me what to do with the engine down the road to make it a little faster...also, it has power pak heads....any idea what it would be at in hp with the parts i have stated? the rebuild he has on it is 500 miles old as well...