I'm looking for a place that sells RB20 parts like cams, valvetrain parts, intake manifolds, pistons, rods, and performance parts of that nature. Does a place exist?

 

Kelford Cams of new zealand sells cams and valvetrain. RIPS of either australia or new zealand(one of the two) sells intake manifolds, they're not cheap either. That's about it for 20 parts, some 25 parts work like exhuast manifold etc work.