Yes if it runs like you say I would pay 3k all day long. As someone else said the engine is probably worth that alone. That tractor would go for around 5 here. Looking at the sheet metal I would have thought is a pre '68 model. Seems to me it's a 66-67 model but would have to check my brochures to confirm. Looks to be the first of the all blue 4000 series.