If you're talking about lower head studs $6,000 makes sense for dealer pricing.
If you can take it out and ship it, I would highly recommend Supertec Performance.
https://forums.pelicanparts.com/supertecperformance.com
Henry posts advise on this board and has a great reputation.
They built my engine and I couldn't be happier. Pricing, performance and delivery time were all exceptional.
Do a search on this board and you'll see for yourself.
http://forums.pelicanparts.com/search.php?s=&action=showresults&searchid=3079383&sortby=lastpost&sortorder=descending&exactname=yes&searchuser=