RMS Alterktion Street-Linx install

Starting to install my Reilly Motorsport Alterktion and Street-Linx kit. It's been sitting in the garage for about 5 years now. I had a break in and lost most of my tools, some of the parts, and the car. It was going to go into my 69 Swinger, but now It's going into my 69 Valiant.

The engine is pulled, the suspension and k member removed and I'm getting at it this weekend.

Additional plans include to put some subframe connectors, some torque boxes to stiffen it up.

It's getting a small block stroker/727 trans.

I'm hoping to get some tips and pointers from members that may have installed one in the past.

Any tips on setting the motor mounts before welding?

How about the rear? I'm putting an 8 3/4 in, but the one I have is in pieces and I figured I would weld up the brackets before sending it off to get blasted and powder coated. Any suggestions on how to set the angle.