273,340 and 360 used the same passenger side mount and the DS is a std small block mount. Is your car push button or column shift now? I know the 904 and 727 use different linkage and a simple fix would be an aftermarket shifter instead of trying to track down what you need. The driveshaft won't work between the two so you will have to have one made. The radiator for the 273 has the in/out in the wrong places for 70-up engines. The headers for the pre 67 cars can be pricey. I would look for a 70's camper and rob the engine and trans from it. The kickdown set up is different on the pre 67 cars as well and you will have to locate a 67-up set up for a 727. The 360 uses a different oil pan than a 273/318/340....for starters