Who cares about cats and emmissios ? It's being built into a 408 so none of that crap matters. And along with the other crap you are talking about again it's getting rebuilt. Most likely going to bore any core he buys. Getting new crank rods and Pistons.
Ever see how poorly machine work was done on 60's and 70's mopars? Horrible.
Nothing wrong with either of those engines in my opinion. I'd go with the lower mileage one myself.
My preference would be a roller la360 from the 80's only because of the easy roller set up.
