F-250 performance parts question

hey guys, ive got a 93 250 with that beast of a motor, the 460. thing is, its getting on in years, still runs great but im just wondering when it comes time to rebuild the beast, what, if any, performance parts, street legal, are out there for the FI 460 ford. i know theres things like cams, bigger injectors, a cold air intake, and exaust parts. my question is if there are things like cylinder heads that are still smog legal, intakes manifolds for the FI, etc. big parts, not just the simple things that most hot rodders tend to do. also, its got the auto, not shure what it is exactly, but its a 4WD truck and the shifts are a bit lazy and soft for my tastes. ohh its in fine working order, jsut not a performance piece.... if anyone has info, it would be a great help! thanks!!