I've talked to a few people about a Fast Ratio arm and the Borgeson box, and they said it would be too twitchy at any sort of speed. So I'm going to start out with the stock arms as of right now.
And as for the coupler. I plan on getting this Bergman no-cut adapter.
https://bergmanautocraft.com/product/direct-fit-steering-coupler/ I have the boregson box, fast ratio arms (with idler bearing upgrade) , firm feel steering sector support kit, with the bergman coupler in my 71 runner (my setup for the past 5 years now) - Driven alot of miles with it on the highway, autox with it - Its not twitchy at all - actually I find it not responsive enough which is why I will be upgrading to a rack and pinion setup this winter - you guys can pm me if you want to buy my setup after i pull it out when the snow starts to fly....
Interesting, I was hoping the fast arms would be enough. I think for my application, street car, they probably would be.
My previous daily driver was a Wrangler with hydro-assist steering, it was remarkably touchy at speed. After a week or two, I didn't notice it and grew to prefer it.
