Get a piece of canvas on a plate. That canvas must have coarse enough texture to be existent in a photo. Go out, put that plate leaning against a car and take a photo with pro quality camera. Take several of them. Have your old car photos available to see the right photographing angles and distances.
Try to repeat the scene with your old car photos. You should add shades and reflections and distort the perspective of your in Photoshop synthesized plate.
The in Photoshop only printing on the canvas is not easy. Canvas texture should cause something to the printed texts and images. You can try dispacement maps and embossing.
Your cavas image must not be sharper, differently colored nor otherwise in different planet than the photo.