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We have just sent away for the PHS document and really want to find out what we should be looking for. We have checked everywhere under seats, dash and carpet for a build sheet. What I do know is that the driveline is all matching and the motor is the YS version. The heads read # 13 and not really sure what this all means. Any help would be greatly appreciated.
 

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The ys block and #13 heads were used on the standard GTO with an auto transmission, the Judge and the manual transmission GTO's used #12 heads. Also, a true 70 Judge used a heavy duty torque rod on the left side of the trunk to hold the extra weight of the spoiler. The standard engine for the 70 Judge was the RAIII 400 code(s) WS and YZ.
 
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