Edelbrock head questions

Thanks for all the replies! Those are the answers I was looking for.
The cam I'll be running is a Crane solid roller, 698801. It is .630/.630 lift with 1.5 rockers, 260/266 at .050, and 292/298 advertised. I was thinking about running a set of Lunati valvesprings, pn 73899-16, as they are a little more compact than the Crane springs. 1.5 od, 197 @ 1.85. They are very close in rate to the Cranes, and alot cheaper. I won't be putting many miles on the car (cant afford to lol), and its just going to be something to have fun in. I'm thinking I'll have to run spring cups, but thats another thing I'll have to figure out. I don't really have the money to have them set up by a shop, but I know I'll have to have them machined for larger diameter springs at least.
Here is another question.
Can the spring pockets also be cut deeper for more installed height, or should that be changed by getting longer valves or retainers that are offset vertically?

Again, I appreciate the input, and if you have any more, throw it at me!