Duster Help

Engine from that info could be anything from 273--360

Start by looking at the top driver's side block head parting line at very front of engine. There should be a long stamped number on there and the CID is usually the first several figures, I think 3-4-5. if not look under on side of block for casting number I think it's towards the rear of the block side on driver side

Here

How to ID a Small Block Engine Block:

Rear axle ID chart:

Mopar_rear_id.jpg