In the late 70's and early 80's I worked with an ex GM engineer. He sold a kit for $1 to defeat the emissions and get the engine to run properly. The kit consisted of a one page instructions, a ball bearing, and springs for the mechanical distributor advance. From memory it goes like this.
1. replace the springs on the distributor mechanical advance with the ones in the kit.
2. remove the vacuum hose from the EGR valve and insert the ball bearing and plug back into the EGR valve.
3. remove the AIR pump belt, remove the lines going from the pump to the exhaust manifolds/heads, and plug the holes on the exhaust manifold/head.
4. remove the vacuum advance and file the open slot restricting the advance tab to the dimension shown.
5. advance the distributor timing in 2 degree increments and do full throttle runs. Do this until you get spark knock and back down 2 degrees.
Did this on my '74 Monte Carlo with a 350 2 barrel. It definitely ran better. The biggest surprise was the gas mileage went from 10/10 city/highway to 14/18.
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