[JustOne]

Sorry Imissed your question on the beehive springs. They do work because they are a little lighter, with the right parts you can run 7000rpm on a hydraulic motor. You will also need titanium keepers and the crane retrofit hyd. roller lifters. The lifters are a little pricey, I think I paid close to $500 for them.
If you go with a solid flat tappet cam you can run the Schubeck lifters which are in the neighborhood of $600, but well worth it considering no cam break in. With this setup you can spin the motor in the 8k range, as long as you don't mind adjusting the valves.
Out of the AFR heads I would step up to the 185 if you are going to rev the motor past 5800rpm.
First decide what you want to do with the motor, and where in the rpm range you want to make power. From following Rick's post on the UniqueCobra web site you could tell that he knew exactly what he wanted, and made a very wise decision getting the TFS heads for his application. He can also have them worked more if he would like down the road and support even more power.