Rounding up all the parts will be the biggest hurdle. And doing the swap will require a good mechanical background. Do you have the OHC-6 already? If so, it will need the bellhousing for the L-6, a V-8 bellhousing won't work. The cross member is different. All the other necessary parts are the same, but I may be overlooking something. Why a Sag 4spd? The 3spd was/is a Sag, 4spd trans were/are Muncie M20 and M21's depending on diffy ratios.