Also one of the other issues you will run into will be the water pump length. On the '91 Dakota the radiator support is further back than the '93. I think it is a pre '71 water pump that will fit, but then you will need to put an electric fan outside as a pusher right behind the grill.
Other considerations:
ADDITIONAL TECH TIPS:
• Fuel lines will have to be relocated.
• Some models will require tranny lines to be relocated.
• V6 trannys and bell housings will bolt to your small block. All factory linkages should be in the same location, and will work fine.
• 727 and 904 transmissions will require a tranny adaptor plate, unless your vehicle
came with a 3 speed automatic (some ‘87-91 models).
• If you change from a 4 speed automatic overdrive to a 727 or 904 transmission, your drive shaft will have to be lightened.
• Some models have fuel pumps in the gas tank. A fuel regulator is needed to achieve the correct pressure.