I've done some research and I'm still confused. Also, there isn't much reviews at all on these cams. I initially wanted to get 106100s, but I've found the 106300s (and 106400s) for a cheaper price. I realize I'll need new springs as well, but are these cams any good for our cars? I'm full bolt on right now (minus TB and have no intake work). I want to keep my Mach n/a, but do not want to do anything drastic. I mainly want it for a weekend warrior. Any advice/opinions on these cams?