I made him give me a stretch length and used that
I tighten and measure them in a rod vice and write down the torque needed for each bolt and use that when I assemble the motors

I did play with those a little bit and found his arp2000 bolts would give same stretch at 75lbft as with his torque and angle method. Take that for what its worth as i was using my old bolt stretch gauge which is hard to get consistant numbers.