Where did you get your front disc conversion?

Can we add a power booster with the scarebird setup? It seems like it would not be a problem but I am not an expert.
Also, the Hemmings article from February recommended buying adjustable upper control arms because of "bump" steer with the '73-76 uppers. I don't see anyone mentioning this in these forums. Is this a concern if I go that direction? The numbers are stacking up pretty close to equal once all is said & done between the late model swap & the scarebird setup depending on the cost of the donor spindles & uppers. The upgrade kits are quite a bit more but obviously, everything is new & shiny.