The Revell W900 is a 1972-1982, but it does have the 8-bag suspension. The AMT T600 is a 1990-94 cab/hood/sleeper with a 1970s frame, suspension, engine, & interior. It needs a lot of work to make it correct. Essentially what AMT did was took a T600 cab/hood/sleeper and stuck it on their W923 frame. These might help:
CM17 Jan 1993 - Updating AMT's Kenworth T600; the rear suspension. album | Dutch Model Truck Club | Fotki.com, photo and video sharing made easy.
CM18 Mar 1993, Updating AMT's KW T600; steering syst & front susp. album | Dutch Model Truck Club | Fotki.com, photo and video sharing made easy.
CM19 May 1993, Updating AMT's KW T600; correcting the hood. album | Dutch Model Truck Club | Fotki.com, photo and video sharing made easy.
CM20 July 1993, Updating AMT's KW T600; the air-intake system. album | Dutch Model Truck Club | Fotki.com, photo and video sharing made easy.
CM21 Sept 1993, Converting AMT's Cummins NTA 370 into a N14. album | Dutch Model Truck Club | Fotki.com, photo and video sharing made easy.
CM23 Jan 1994, Updating AMT's KW T600; installing the Cummins N14 album | Dutch Model Truck Club | Fotki.com, photo and video sharing made easy.
I've never built the Revell T600, but I understand it's a 1986-89 T600A. Perhaps some other builders can chime in on how accurate it is. It has to be better than the AMT T600.
Good luck with your project.