Need to know what engine you got gas, 5.8, 7.5, know it can't be the 4.9
I don't have acess to flat rate here but i am sure someone does, wait a little while for an answer.
The reason i ask about the eng. is for other techs.who may have that info.
I will say this, a long time! Prob. 14 hrs. Ac,&ps i am sure. Emission equip.air pump w/tubes.
Bolts in exhaust rusted,, air tube(if equiped) rusted and prob. will break. Changed my mind i would do this job by the clock only
forget the flat rate may take a week, in a van!