The KW engine is an NTC 290. It had a turbo but the regular intake manifold like in the Freightliner COE kits instead of the aftercooler like other turbo Cummins engines. The other one would be an NTC 350 or NTC 400. Most likely, judging by the name plate(It says Freightliner instead of White Freightliner) I would say it's a BIG CAM. Cummins introduced the BIG CAM in the mid 1970s.