Help Identifying Original Mopar Engine for Dodge D300

Hello everyone,

I have a Mopar engine in its original box that has never been opened and still retains its original seals and metal straps. The replacement engine was purchased around 1984 for a small Dodge D300 truck manufactured between 1970 and 1975. I do not want to break the original straps, so I need to identify the exact model of the engine without opening the box.

To help with identification, here are the box measurements and some technical data (box weight):

• Box Measurements (converted to inches):
  • Length: 49 cm ≈ 19.3 inches
  • Width: 63 cm ≈ 24.8 inches
  • Height: 36 cm ≈ 14.2 inches
• Technical Data (Box Weight):
  • Puncture Test: 1100 units
  • Combined Cladding Weight: 264 lbs per 1,000 ft²
  • Maximum Size: 120 inches
  • Gross Weight: 350 lbs

I would greatly appreciate any information, experiences, or suggestions that could help me determine the exact model of this Mopar engine.

Thanks in advance for your help!

Best regards,