Do you need emmisions legal or just a combo that will pass emmissions?

Swapping cam and heads and long tube headers and such is not technically legal but you can do a lot and still pass the sniffer and keep the CEL off.

Also is this a 2wd short box regular cab hot rod/daily driver (light weight) or 4 door 4wd used for towing (heavy weight)?

I am not causing global warming, I am just trying to hold off a impending Ice Age!