The stock driveshaft does not need any modifications. The yoke that came out of the turbo 250 tranny will fit the turbo 350. Replace the stock front universal joint with a heavy duty one. The driveshaft length is the same for a 9" Ford rear end whether it is an aftermarket or stock Ford 9". Replace the rear universal joint with a Ford Chev combo joint.

    The drive shaft loop can be purchased as shown here or you can buy a universal one for about half the price. I opted for the universal one. Cost $36.85