1) would be of some benefit but not a huge difference. IMO you`d be better off with a Lee 670 steering box than the R&P. Better feel and half the cost. For 2) you wouldn`t want to use tall lower ball joints,just uppers. Our X-Tall Severe Duty uppers would be even better. They provide more benefit than the G Mod with no fuss.
3) is an outstanding option,especially if you`re looking to do a big brake upgrade too. If you`re running the 12.19" 4 piston Wilwoods now,the Baer GT-AFX 13" set up would be a nice upgrade in braking performance. The Baer`s use a 2 piston C5 based caliper with a larger piston sweep area than those 4 piston Wilwoods and being DOT approved calipers with dust and moisture seals they hold up better on the street.
4) No benefit to that at all,unless you`re trying to dispose of some extra money you just have laying around.
You could upgrade to our adj. tubular arms which would give you more adjustability and less weight but just changing arms won`t generally help performance on it`s own. Mark SC&C