mmvette80,
It's hard to tell exactly, simply because some of the components that I purchased came to me in lots with items that I did not need. So, I ended up paying for more than I needed and sold the rest to recoup some of the costs. However, I was patient in looking for the items that I required. I don't think I spent more than a couple hundred dollars, not counting the exhaust system, probably less.
When I bought the car, the smog pump was there, however that was about all there was. There was no belt on the pump and no control vacuum hooked to it. The exhaust had been changed over to true duals, no cat. The heat riser had the butterfly removed, so it was junk. The down tube for the A.I.R. injection was missing. The EFE was missing as was the mount and spacers. The thermostat housing had been changed to one that did not have provision for the thermal vacuum switch. The TVS that goes into the intake manifold had been removed and replaced with a pipe plug. More than likely this was all done in an attempt to add power. As JohnZ mentioned, these items really are not the reason for the lack of power in these years of cars. Blame it on the lack of compression, lousy heads, carb calibration and timing, 'smog' cam, etc.
Mine has all of the smog equipment in place and operating correctly now and the car still builds appreciable power. Most importantly, it builds that power and still is able to pass the very tough California visual and sniffer inspections. If you'd like, I can give you a bit of a run down on what I am currently running - although that may change at any time the whim hits me
