65' Dart straight axle info

hey hows it going dude i got a 66 dart with a 383 stuffed in it 13:1 big *** tunnel ram and dual 600 holley 4 barrels which speedway kit did u get the ford or chevy and was it the 44inch axle or the 46 inch axle like i really didnt know where 2 measure and went from ball joint 2 balljoint and got like 45 inch but im not sure if thats right place 2 measure for the straight axle so if u could get back 2 me asap i would greatly appicreate it thanks dude