Well as you Know than, if every needed part and tool was on hand you would only need a day to pull it down and put it back barring a crank grind. Add a light hone, fresh rings,a bit of valve paste, The cleaning is the big time sucker. With your background I guy like RF Watley at Beno's in Winter GA, you clean, he uses all the service tools you guys could bang it out in a day. Money and time well spent because when you get on the seat of a 72 Combat your going to find yourself hitting the 7000 mark all the time. Trust me if you like old iron running down the road as much as I this isn't even a question. Without the sludge trap clean and a good oil filter fitted up you are at risk. Bearings be dammed. JMO you will really enjoy that day, and with your background and learn the whole deal in one day. If Richard can't help, we will make you an appointment up here in Michigan.