I note with interest you note regarding the clutch lever movement on a model "RC" tractor.
No the clutch lever on the model's "L", " C ", early " D " and " RC" tractors are ALL mounted on the right hand side of the transmission, and YES they are all puled back to engage, and pushed forward to disengage. Then with the Falmbeau Red tractors, the levers were mounted on thje left side of the transmission - these were pushed forward to engage and pulled back to disengage the clutch. I am sure that a Waukesha engine would NOT fit up to a model "CC" or "C" tractor Transmissin housing. Hope that this clears up your query.
Alan T. Lewis