Need Advice, Suggestions

Ok, the saga continues: I got a call today from Gary's Driveline in Daytona Beach this afternoon.... He asked me to come over so he could show me what he believes is wrong.. I went there and he said the pinion angle was at least 14 degrees off..(I should have taken a pic of that) and that the driveshaft which is a two piece (rubber encapsulated on the end that goes to the pumkin) was a piece of crap...also he believes the spring perches were rewelded in the wrong position,,,hence the pinion angle issue....Now here is the really interesting part...while I was looking at the leaf springs, I noticed the drivers side had 5 leafs and the passenger side had only 4... Gary was puzzled by that...he's not really up on mopars...anyway, I told him that I had bought them from Mancini Racing 2 yrs ago when I had the body work done and when it had the 7 1/4 non posi rear end in... So I called Mancini and talked with Tony... he told me that the springs were on the wrong side, that the 5 leaf goes on the passenger side and the 4 leaf goes on the drivers side, do the the torque of the motor, he also said all mopar muscle cars were that way?? true or false... I am attaching pics so maybe you guys can guide me on this issue... he also told me that part numbers ending with even are for right side and odd numbers for left which i agree with.. true or false???? thanks for your help, John