318 Threw a Con Rod. Now What?

Bein's as how 360 weights are nowwhere near anyplace you can mount them on an OEM flexplate, I'd like to see how that was done

Same here. Anyway, find whatever you can afford and throw it in there. Only thing you will need is a torque converter for a 360 or like someone else said a weighted flexplate so the engine will stay balanced. Magnums balance differently than the LA. If it was just a daily driver car I would just leave the new engine just the way it is and drive it. Of course new gaskets first because it's easy to do with it out of the car. Slap on the four barrel and the 600 eddy if you want some more oomph. What intake and carb is on the thrown rod 318?