I was able to get her working!
In the end I just started takig things apart, starting with the easiest stuff, and thankfully, found the culprit early.
Apparently, the previous owner had left the thru-hull open on the intake and something that looked like a cross between alien/predator had inhabited and completely blocked the intake tube. After taking it off the head and thoroughly washing it through and reattaching, it works like a charm!
Thanks again for everyone's help