____Driveshaft Question??

My friend just did the 7 1/4 to 8 3/4 swap he had a new driveshaft made up at a cost of 240.00...you measure it by inserting the trans yoke in the trans then pull it out 1" and measure center of u-joint cap to the center of the pinion yoke,make sure the car is on the ground or a drive-on lift...