FUNFER2 Kevin, if money is not a problem T&D or Jesel would be the first choice. I have the T&D setup going on motor #2. You will need to get machine work done to those heads for the base support plates. Once this is done you can't go back to the shaft setup.
If we are talking about bolt on kits, Erson wins out. Running them going on 4 years and no failures yet. H&S have been around along time and some guys have had good luck with them. The FE MAX and Shelby look good but price, IMO too to high. I would look at any rocker with bushings for where the shaft rides. I don't like aluminum on steel shafts.
The other thing is how big the camshaft is and spring pressures closed and open?? I am not a big fan of turning motor 7,000 rpms. You didn't say what you where looking for, HP or Torque? You can build a nice 482 with 4.25 stroke and 4.28 bore. This will help the heads work better and make more power. Build a durable motor and limit the rpms to 6,500. This is not a SBC or SBF. Good machine work,
oil pressure in the 70's, and a cam with .650-670" lift will make a strong motor. More than the cobra can handle. Talk to barry R. about location of the heads on the block for power improvements. He did this for the EMC motors. Rick L.