Is this factory? 1974 fixed bumperbumper

Nope, not factory.

So, I'm going to go out on a limb and say that the original fender to bumper brace was damaged in the accident, because that's not a fender to bumper brace. The brace itself looks like it could be a fender to cowl brace to me, but at the least I don't think it's originally a lower fender to bumper brace, which would explain why it wasn't the right length. Could be off of something totally different too. Or maybe a wiper linkage? At any rate, doesn't look like the original fender to bumper brace. The extension is not factory, that just looks like a chunk of metal they had laying around.

The original fender to bumper braces should look like this, the original is on the bottom (I extended the top one, to push the fender further out to clear my 275's up front)
IMG_1950.JPG

As for the bumper, '74's were weird. They started out with shock mounted bumpers and only the single mounting hole in the frame rail (for the shock mount). Then around December of '73 there was some kind of production issue with the shock mounted bumpers, and the factory switched back to standard brackets. Those cars came with all 3 bumper bracket mounting locations, the standard 2 up front as well as the 3rd one for the shock bumper bracket. They were that way for the rest of the production year, having all 3 mounting locations but equipped with standard, non-shock bumper brackets. So, whether or not your car came with a shock mount bumper is dependent on when it was built. Based on the fact that it has a standard bumper on it now, it probably didn't come with the shock mounted bumper, but if it was wrecked they could have swapped frame rails or added the mounting locations. Either way, it has the standard bracket mounting locations on it now.

67-73 cars only have the front two locations (standard bracket mounts), early to mid '74 model year and 75+ only have the shock bracket mount, and mid-74 until the end of '74 has all of them like shown.
img_1917-jpg-jpg.jpg

The other styles of rails, the later one is labeled incorrectly, it should be early '74 and then 75+ for the shock mount only
aframerails-2-copy-2-jpg-jpg.jpg