Front end popping/settling noise when car is parked

GreetingS FABO!

Working on memory here...I recently did the disc swap on my 65 Barracuda w/new bushings/balljoints.

No front alignment yet.
Alignment is "roughed" in.

But after driving car and upon parking, the vehicle sorta "pops" when sitting still as if..[settling] is occuring..?

Upon finishing install of parts and assembly, i did the push up & down on FE to help settle in.....before torquing to specs.

I read in a thread somewhere but cannot find it to recheck myself.

Whats happening here?

Although it doesnt seem as frequent as when i initially completed task.

Also, what alignement spec are recommended for street cruising?

Thanks FABO!