They can take him in as FIV is spread only by deep bites. There are multi-cat households that have an FIV cat in their crew.

If he has a great personality, there is no reason they couldn't take him in.

I did a search and found links to several PA places that take FIV+ cats.

http://www.thebestlittlecathouseinpa.com/

http://kittiesfromheaven.dreamcatcher-photography.com/

He is beautiful! I hope he gets his furrever home soon.