Check for the X as someone said. Also the SD was only available with the M40 or 4spd. Also early production 4spd cars are RARE as there was a hold on 4spd blocks as if I remember the thrust main was a problem(there was a sheet to all dealers). When I took delivery of my auto in March the 4spd cars were still on hold. The vin will be on the block in the front next to pass.side timing cover.Also the suspension would have to be changed for the extra weight as the SD is Heavier than a std 350 or even a 455.
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