The 7006 is the best overall k27 you can put on there if you like horsepower and want to use a k27.
3K Borg Warner has not made or sold parts for the old 3ldz for a while now.
Call Durabilt Turbo, the number is on this link,
http://www.durabilt-turbo.com/ and ask them if they have any parts or will make any parts for it.
There's a few other places you can call and try too.