I have the Mallory AFPR #4309 (i think), anyway, I bought it still in the box from someone and it did not include instructions. Can someone please let me know how to hook it up?

I'm using that same regulator now, my setup was TBI, now carb. I sent you a pic of my setup.

Thanks, does it come ready to bolt on, or do I need to install the springs that came with it?

The different sized springs are for different pressure ranges.
small one, 3 to 12 psi
med one, 10 to 40 psi
large one, 35 to 65 psi

If you're going carb, the little one may already be in the regulator, mine was. But then I bought mine new.

I sent you another email with mallory's number in it, and the warning they gave.. do NOT use teflon tape to seal the threads.