Smog headers or manifolds 1972 Chevrolet C/10 350 V8 with California Emissions

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Replaced the cracked manifolds back in 1990. Put on smog tube adaptable headers. I recently had the engine rebuilt and the headers were warped enough to not work after getting the engine back from the machine shop. I want to keep all of the California Emissions equipment in tact. My parents bought the truck 5/26/72. It was built right at NUMMI in Fremont. I want to keep it as original as possible.
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