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17 years and the heads. Boss heads are basiclly Clevland heads with modified water passages. '69s had 2.23 intakes, '70s had 2.19, I believe. 300 factory horse power. Pistons were also of the pop-up type and had approx. 11-1 comp. Not a good swap into a truck because of lazy bottem end torque, but for speed??? Hum...