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This sweet GTO came in for a 5 speed manual transmission swap. It had a tired 326 that had replaced the original big block at some point. The owner wanted to keep it Pontiac. When we  and the 326 was on its very last legs. He sourced a 6.6 Pontiac to replace it with. Surprisingly, even though Pontiacs use the "same" block for big and small blocks there were changes between the 60s and 70s that necessitated some changes to replace the vintage 326 with the 70s era 6.6. The swap required engin …