I had an aluminium radiator made for me by Pace Products in the early 1990s. Yes it helped but the Mulfab radiators are deeper and have a larger capacity so I'd go with that.
Just do an eyesight check to ensure that the oil cooler radiator isn't sitting when the bottom of the radiator needs to be.
Concerned that your radiator isn't mounted on bobbins. With the amount of flex in the chassis and body, the poor radiator needs it.
By the way, if you are inclined to remove the radiator supports and tidy them up, do not try straightening them if you notice that each side is not symmetrical to the opposite side. If you try and equal the bends, you will discover that the radiator will foul. Then you will have to undo all your lovely work and try and get it all to align again.
Oh the joys of a handbuilt car created using blacksmiths tolerances!
