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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.
I second this idea...you can get the roller cam reground cheap, toss some hughes #1110 springs and retainers and have a solid 300HP motor.
2nd choice would be to find a low mileage but rusty '85-up 5th ave and pull the motor from it. roller cam, higher compression, 302 closed chamber heads....add headers, a small 4bbl, and get the cam reground and use hughes #1110 springs and you'll have a solid 240-250hp motor with similar torque as the magnum (it'll probably fall off faster over 5000 RPM is all)....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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