Northern Auto Parts have about the best prices around for kits. Thing is, check the kit you chose very carefully. They usually use top quality parts and I`ve gotten countless kits from them without any issue. While I would recommend you check the pistons before you order, find out what pistons are included and ask the compression height, make sure they are 1.560.
Most "rebuilder" pistons are 1.540, this kills quench, compression and power.
Another good thing about there performance kits is you get to pick what you`d like, in the performance master rebuild kit you even get to pick a cam.