The repros go on dry. They come with no instructions and you get one chance to get them on straight and the "Chevrolet Camaro" line is not parallel with the other 3 lines of text so don't use it to align the decals to the door. (Ask me how I know) Use the bottom line. There is no dimensions for putting them on, I've seen sets on different cars that vary by two or more inches up and down the door.
They come on a piece of 3M backing with a layer of oilskin type paper over the adhesive side. Trim the backing down so it is just slightly bigger than the decals, it makes them easier to position. Put them on with the backing still in place move them around till you find a position you like tape the whole thing on, and step back 20 feet an look at make sure they are where you want them. Once your satisfied everything is straight and centered add some more tape to the top edge so it can't move, flip the whole decal up and peel the backing off at the top edge, and start peeling it down. After you get enough off to flip the whole thing back over onto the door do it and keep peeling the backing down until its off. then starting at the top and working down press the decals tightly onto the door with a roller or squegee to get the air bubbles out.
This is a fairly tough job as you applying a decal roughly the size of the whole door and trying to get it on straight, and without bubbles. To make matters worse there are all kinds of edges in the lettering that can get stck when you are removing the backing making it easy to tear a letter in half. If you don't feel comfortable doing it, pay someone. The decals are almost $300 and you can't buy a single side so if you screw one up your out $600, plus you run the risk of screwing up the paint on the door getting a messed up one off.
you can wax over the lettering, just be careful not to catch the edge of a letter with a rag or buffing pad. It's real easy to lift the edge of some of the smaller letters, especially the comma In "May 31, 1969"
As far as buffing the pin stripe off I guess it would depend on what kind of paint is used on the car, mine was acrylic laquer and they were applied over the clear coat and they came right off with regular rubbing compound on a buffing wheel.
1969 Indy Pace Car
350/300HP RPO Z11
My 69 L48 - 350/300HP Engine