Front end rebuild

I'm starting the front end rebuild on the Shark. A 1968 Barracuda, 318 car with 10" manual drums and power steering. I have decided to stick with the original style components and torsion bars, add a sway bar, and go with Poly Bushings.

But, I would like to use offset uppers in order to get more Caster since I now run Radial tires and the power steering was always iffy. I cant find offsets in any of the available kits and would have to buy them seperately. I also can't find them in Poly, only the Moogs in rubber.

So, the questions. Is the increased caster worth throwing out the Polys that come with the kit and spending another $100.00 for the Rubber offsets? Will I have a problem running the Rubber bushings at the upper control arm and Poly's everywher else?

Another question. This is a road car, it won't ever see a race track, and probably won't see 5,000 miles each year. Local "experts" are recomending that I "box" the lower control arms by welding a sheet of steel to the lower surface to stiffen them. What's the general opinion on the necessity of this? If I do it, what guage steel would be appropiate?

Thanks,
Hugh