All 69 M-Code cars were built right on the Chrysler Assy. line not at Hurst. They were all floor shift automatics,manual drum brakes,and rear end gears of either 3:55 or 3:91. A.C.,power steering,power brakes or disc brakes were not available options.They all have rear spring front welded torque boxes,like a drop top has. Also on the data plate,cars with SBD before 329 will have either A13 or Y39 called out,but not both.I don't remember which one.After that date,the tag will have both. John.