Eddy heads. Can I/Should i...?

BJR,
Thanks very much for taking the time to fully explain whats involved. My gut instinct is that the heads were not really appropriate unless i did a complete motor rebuild to specific spec which I dont need as the motor is only 3 years built and runs well. I'll stick with what i have and put the cash into areas that i really need. I especially apreciate the theory which you've explained really well.
cheers,
Tim.