Swapping spindles for rack & pinion

If you're thinking swapping side to side for a front mounted rack and pinion, don't do it. Look up "Ackerman steering" for an explanation.
There are quite a few things involved in design a steering / suspension system. You will need to do lots of research before you do it yourself.
Back in the 70s, I had several Pro Stock drag racing friends. Some would just put things together without really understanding everything involved. Some ended up crashing... one because of doing exactly this.
Talk to Hemi Denny for advice on this subject.
If it's done properly, it will not be cheap.