A few things to consider.

Yes torsional strength but more often overlooked is critical speed.

If you're getting new 1350 yokes I would upgrade the tube to a larger diameter as well. Now you've increased both torsional strength and critical speed.

69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700