There may be manufacturer's marks such as abbreviated name on some of the visible areas of the castings.
For example, I believe Ford embossed 'FoMoCo' on some castings, including manifolds and gearboxes, but I don't know how universally, nor how far back historically.
Regarding materials, the pale-coloured tube on the side of the radiator might be of aluminium: it is of similar surface appearance to the brake cylinder.
While the bit of blue tube or cable, and the plastic oil can, might be co-incidental rubbish rather than "with" the car when it was abandoned – or fly-tipped. I can't tell if the tube / cable is attached to any fitting, but if the oil-can had been there as long as the car, I might expect it to be disintegrating by now.