I actually found a correct date coded set for my 71 Challenger R/T Clone project...... 2951865 RT and 2989879 LT side... My goals for my project are to pretty much build a brand new 71 challenger with common sense upgrades so the car actually handles, stops, and goes much better than any stock car could. WIth a 3.54 gear Dana 60 and 500HP on tap it should be able to knock down easy 12's in the quarter while looking the part of a high dollar show car.... I am thinking about adding AC as well but need to figure out the compressor mounting with a shaker setup....