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The 318 has a different (lighter) driveline than the 325 and up to make it less expensive and it doesn't need the strength for the smaller engine. The 4-door has a slightly taller final drive ratio and should bolt-in.
There is a fuel injector swap available where more modern (and cheap) Ford injectors are used to atomize the fuel better, a few mpg are possible.
Do the fan-delete mod. The fan appears to not be doing anything anyway because it is too far from the radiator and the ducting shroud is missing. It's just churning air around in the engine compartment. Electric fan is a good idea to manage hot summer days.
Grill block as much as you can get away with while not overheating or relying on the electric fan.
+1 on the underbody panels to clean things up a bit.
I'm thinking of getting a similar vehicle so I'll be watching the progress on your modifications. Good luck and please report back often!
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Good design is simple. Getting there isn't.
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