What do you actually have for caster now? And what tires are you going to run?
Usually with the offset UCA bushings about the best you can do for caster is +3.5*. Which might be fine depending on your tire choices, like if you’re gonna run 225/60/15 BFG’s or Coopers that’s fine.
If you’re going to 17/18 rims with wider tires than 225 you may want more caster too, the wider the front tires the more tendency they have to track ruts and things and more caster helps a lot.
If you have manual steering there also may be a number you don’t want to go past, the more positive caster you have the more stable the car is- but that also means more resistance to turning. So, more steering effort.
I run 275/35/18’s up front and have run everything from +3.5* caster all the way up to +8*. For me I’ve determined +6.5* is the happy medium, below that the 275’s start to go where they want. And above that it starts getting exponentially harder to steer. I still run a 16:1 manual steering box though.
So if the plan is to run really wide front tires, you’re probably going to want adjustable UCA’s too. If you’re not going wider than 225 or so then the offset bushings and stock UCA’s will probably be enough, as long as you find you can get at least +3* of caster or so.
