I don't want to be disagreeable, but this discussion seems to have settled on the quality of the kit, and AMT in relation to Revell and the rest.
Given that a person simply asked "What level is the kit", my guess is that the question was about the required skill level. I think Rob's response about various levels and parts count is right on the point. One thing that Rob didn't mention was that for a while, Revell used different scales - some years 1-4 and other years 1-5, so it is an inexact science at best. Another is that sometimes simpler paint schemes got lower levels than two- or three-color schemes, even on the same set of plastic parts. I couldn't help but notice this on the NASCAR kits of the early 1990s - different "levels" for the same Chevy Lumina, for example.
So I would say that the AMT truck kit is Level 4, without trying to split hairs too much. The question was probably an effort to find a suitable gift for another person, rather than a determination of whether or not the questioner wanted to build the kit.
Rick