1966 Barracuda spindle advice

Hello,

I had my UCA's ripped off by a scammer/welder and am going to order some new ones tomorrow. I'm on the fence about going to the bigger balljoint/spindle setup for a couple of reasons:

1. I just renewed my entire stock brake system (Drums) and everything is working great. Will the newer spindles still work with my 10" drums or will I have to upgrade to discs?

2. I also just refreshed my entire front end suspension. Will I also have to replace my lower ball joints to work with newer spindles too?

Thanks in advance,

-Seabee