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I am running a PFRPG and am wondering if their is anything in the Rifts "core" book, that I could use? If there is another thread that covers this please re-direct me to it. Thanks in advance.

Unless you plan on having SDC grade Ley Line Walkers, Psi-Stalkers, other similar OCC's, and maybe the Rifts themselves, not really.

Yeh, Id agree. Rifts core book wont bring much to your PF game.

What about more psionics/spell?

The only thing I can recommend is to include (from RUE) the spell casting time rules (how much time it takes to cast spells rules.)

Other things you might include are the HU Hand to Hand APM changes that were brought to Rifts in the RGMG.

As for spells and Psi powers, I just lump most the spells and powers together in the available pool when talking about common magic spells. The only ones I would exclude from a PF game would be setting particular like "summon NighSpawn" or say the 'tele-mechanics' psi powers.

You would be better looking at stuff like :

Heroes Unlimited 2e Books for things to use. Weapons, Spells, powers...
Nightbane Books for things to use. Weapons, Spells, Magics, OCCs, etc...
After the Bomb 2e Books for things to use. Mutant Animals, and features...