Sounds decent for a long block price. A short block is about 1400$ or so. And the "knocking" sound isn't from the HPFP looks like, and indeed from the rear valve cover (middle) area. Does the sound vary directly with RPM, and does it make a difference if the cover is on or not? If the cover mutes it substantially, it is very likely top end noise in which case we are back to the lifter and possibly camshaft scenario.
As we know from bpd's build, a built block is good for at least 600 AWHP (with meth kit), well past daily driver levels for the trans. 500 AWHP or so is about the limit for the stock trans for DD duty.