Andy,
I can probably get you some pics this weekend, but I'll warn you that there's not much visible.
As far as capacity, the 5.0 would be putting out more BTU's and therefore have a higher cooling requirement. That being said, the Rover engine is not nearly as forgiving as far as overheating. Probably a mute point as your wedge probably doesn't have the same rad as the Rover powered cars.
I was looking on EBay for aluminum radiators and it really pays to get a rad for a popular car. Some of the lower profile ones, like for a Camaro, look like they could be made to fit at an angle. As I am finishing the shock & spring install this weekend I will take a look.
What year was your wedge?