Quote: I would pass on both engines. Find yourself a 90's magnum 318. Will be stronger and get better mpg than either of the engines you mentioned. They have moly rings so they last much much longer than the old 318 and 360's and being run on fuel injection their whole life means that they will be way more clean inside. Even if you ditch the EFI and switch it to carb you are still better off IMO.
Putting a 318 magnum into my 70 coronet was the best thing I ever done for it, dead nuts reliable. Put a 4 bbl holley on it and gained mpg over my 2 bbl 70's 318. The magnum is much more efficient than its ancestor 318. Not to mention, it has a lot more power.
