alignment for F-spindle swap

I just had my 68 valiant aligned using specs found on this site. The car now has the factory 9" drums. The plan however is to convert it to big pattern F-body spindles.
I have put all new bushings and ball joints in my current a-arms and lower arms.

What to do with the upper ball joint? I've been thinking about using the tapered adapter, found at doctor diff, so I can retain the 72-down upper balljoint. Is this any good?
And do I need to realign it after the spindel swap has been made?

Or should I just get new upper ball joints as well?

What about the bushings in the A-arms, Will they fit in the 73-up A-arms?

Thanks,

Antoon