I didn't even fool with the boots that came on my new lower ball joints (forgot brand), because the thin rubber seems to fail long before the ball joint does. I used Energy Suspension polyurethane boots (normally tie rod ends), leftover from my Mopar stash. I posted the PN, but GM ones might be easier to find. Autozone carries at least one PN (bought recently).

Rollguy posted the best trick for using the monster C-clamp ball joint press. Tighten, tap the end of the loading bolt w/ a hammer, repeat. That seems to encourage it to slide in. I used the Autozone rental press, and was alarmed to see the massive C-clamp deflect as I resorted to a cheater bar (didn't think of the tap trick). After halfway, seemed it wouldn't make it flush so resorted to a torch around the spindle hole which seemed to make pressing easier. When/if I repeat, I will heat the hole first. Didn't help that I measured the new ball joint end slightly bigger than the old one. Since then, I bought the HF press on sale.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans