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The L78 rectangular (sorry, I called them square port) port heads for 1970 were a specific casting # and tough to find the right dates for the engine that was in my car. I have heads for the 302 in the 69. I saw those heads on Craigslist and almost bought them. I think you're referring the factory replacement heads the guy advertised.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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