'68 was the first year of the 465, but the 420 is possible. either way, the "4 speed transmission" would be on the glovebox label. my guess is that its a factory 4 speed but the p/o called it a 3 speed because it only has 3 normally useable gears.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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