"Nash", the repros 'might' be thinner but I doubt it, but the slant should be the same , front to back....the 400`s would also have a different 'tilt'= thinner, because of them sitting on the scoop bulge...350 `s are thicker to push the tilt up , since that hood is 'flatter'...but the pins/studs that gets speed nuts on the back are differently located on the 400 and the 350 (possibly just because of the numbers themselves are different) and 400 are also not even opposite...they are not a reversed/'reflection' of them selves in other words, holes are different from left side to right side...dont remember if 350 emblems are 'same' on both sides..