72 big block motor mounts

[BB72CHEVKT]

This is my first thread so bear with me and be gentle. Got a 72 c10, swb, bb396 w/turbo 400. I bought the truck some time back 95??? used to use as dd. I am 3rd owner and truck was fairly stock cst dlx changed to auto, ps, pb had 350 ran great til I wore it out. This is where I goofed I should have stayed sb but could not resist bb. Got bb built and broke in on dnyo w/440 hp @5700 rmp good for the street. Had twins. 6 years later still on stand in garage not in truck. So its about time to get back at it. I have loads of great parts but need advice on a few things listed below. Thanks for your help.

1. correct motor mounts and towers
2. automatic steering column
3. blazer gas tank conversion kit or another option