That's funny......
I just installed an A body ECP radiator in a '57 Savoy 360 conversion project for a customer.
After carefully measuring everything and locating it to the car, it worked out great.
Had to drill the holes to mount it, overflow does point to drivers side.
Also Installed a matching polished overflow on the passenger side,
I just looped the hose around from the neck to the overflow reservoir and tucked it up to the core support and all is well.