Cam card specs meaning

Update: I decided to go with the Hughes 232/237 @ .50, .540/.548 lift. After talking to the tech, he seemed to think it would be a good cam for my intended use of the car. I didn't have the Eddie heads yet, so I ordered them from Hughes. Same price as Summit, and he even waived the shipping fee for me. I also ordered a timing chain along with the cam, lifters, heads, and some gaskets.

We spoke about springs, and for an extra $100-$120, they would install the proper springs for the cam. Seemed like a reasonable price. They will be a single spring, so break in won't be an issue. Plus, I feel more comfortable talking to their reps than the others. BTW, he said the seat pressure needed for that cam is 135 lbs, and went on about some other specs, but my mind was in a fog.

I got a hold of Lunati's tech, he seemed pretty lethargic. I asked if the springs on the Eddie heads would be OK for the 60404 cam. I told him that the Eddie springs were rated at .575 lift, and he said that sounded fine. He really didn't bother to ask any more questions.

Thanks for all your input. I am learning a lot on this site.