Hi Dave,
A couple of early photos of 274 radiator fit.
Now tidied up a bit but essentially the same. There's a steel 'joggled' bracket holding on to the bottom using existing holes and I cobbled up a steel rod restraint for the top using parts of the donor's bonnet hinge mechanism. It has a bolt into the top fixing of the radiator and a double nut above and below the existing bracket slot at the chassis end.
Not that the radiator does slope (oops!) forward and has an electric fan with a thermostat in the top hose.
I hope that helps.