Help! Converting JAA ATPL to FAA
 

Could anyone enlighten me on what is involved in converting my JAA ATPL to an FAA one? Is there a flying test; if so how many hours would I likely need to prepare; costs, etc? How severe is the written test?
Secondly,
I noticed that for a typical major....
I need 500 hours PIC.
Now, I am an FO with 2800 hours and A320 and 757/767 ratings. I thought I would have a pretty good shot at jobs in the USA (I have citizenship already). But since I went through the JAA training and joined a european operator, I have only 150hrs PIC. Loads of SPIC when Captains have given me sectors, but I does that count?
Are there operators who wouldn't have that requirement?
Appreciate your help!! :O