Emissions crap on a 74

I could be wrong but I think all the '74s had was the EGR system, some timing/choke controls (a timer and vacuum switch), and the evaporative control (the charcoal cannister). None of these will negatively affect performance if they are operational. Although usually the EGR is carboned up and not working, the evap system has had a line or two cut or the check valve is dead, and either the timer, or the vacuum switches, or both, are no longer functional...lol. I'd say check your local laws, and then look at what can be done. It would suck to change something and then when it goes to be registered be told to put it all back...