Common problem with TRS and SSM set ups. You need and alignment tool and you need to take the time to make sure the alignement is correct once the engine mounts are tight. You may want to loosen the pront and jocky it up or down as needed. Because of the long distance between the front mounts and the rear mounts a tiny movement up front amounts to a 5-10 raidians at the rear. The drives should slide smoothly on and off, anything less and you have a problem.

If you are soda blasting make sure you neutralize properly or all of your hard work will be for nothing.
Friend blasted his and had them painted. They turned out a matte finish. Painter asked him how he removed the paint and he told him he had them soda blasted. Google it soda prep.

Fog them with White Vinegar after soda blasting. Go to GFS or Costco and buy it by the gallon.