20V cams - CATCAMS vs KELFORD?

[Grant]

Hello all, I've been on club4ag for a while now - California based forum for 4AGE in general.

I'm looking to buy some cams for my 20V blacktop. I will be using them with stock spring, stock valves, etc. The only thing I wish to change is the valve shims to set clearances on the new cams.

1. Do you prefer Catcams or Kelford cams? Toda is too expensive.
2. What is the largest cam duration and lift I can use with VVT?

I was thinking something like 8.5mm lift and 272 degree intake, 280 ex.

Thanks!