Cummins in a 69-71 Dodge pu
I think it fit if you used the one ton cab set up , they were mounted migher , the cabs for more room .
I would realy think hard about this one , the power steering in the 61 through 71 were not that great and the steering gear boxes are very light weight . The cab floor would need siffened up as well .
But if your game i got a 69 to 71 short wide box ill make you a screaming deal on pm me for details