I put big block A-body bars in my Barracuda when i rebuilt the front end and did the disk brake swap. I have absoultly no complaints about those bars and the \6. The car handles much better, bottoms out less and there was no noticable degadation in the ride. If you are taking the front end apart to rebuild I would go with the big block bars. FWIW, I also have the heavey duty 6 leaf rear springs in my car.
I also used polygraphite bushing in the upper control arms and strut rods. I was told to not use them on the lower control arms because the wear out to fast. The upper control arm bushings have been fine but the strut rods bushing creak and grown all the time. I purposely purchased the polygrahite to elminate that but it stil happens, I can squirt oil on them and it will quite down for a week or so but comes back.
I am starting the 360 swap into my car this weekend and I will be swapping in a small block spool mount cross member, I am going to swap back to rubber bushings on the strut rods.