Mallory Unilite ID help

[66340SEDAN]

I picked up some parts not long ago and this old Mallory Distributor was included....it has number 40112 on the main body but no other identification. Does anybody know what it fits? I’m assuming MoPar, possibly small block? Thanks

 

[67Dart273]

Does the mechanical advance function? If so, easy. Hold the shaft, "spring" the advance. SB you can move the rotor CW, and the spring will pull it back CCW B/RB is opposite. So if it comes out B/RB all you have to do then is measure the install length (from block mating surface to end of shaft) and see if someone on here has either one they can measure.