Roller Cam Specs for 340

Morning FABO,

I am brand spanking new to the world of engine building and am putting together a 71 340 roller this summer. The block is .60 over, X heads, shooting for 10:1 and forged internals. I really don't know what kind of horse power numbers I could be able to expect but I'm shooting for as much as I can with the set up that I just described. Sourcing roller cams for sbm's has been kind of difficult but I have finally found some options through Howards. I really don't understand exactly what cam specs mean or what kind would be appropriate for my build so I decided to come on here and ask you guys what your take's on my set up are. If you have anymore questions or comments on my set up please do not hesitate to say or ask anything, any kind of information is seriously appreciated. Thank you for reading.

Ethan
What kind of driving will you be doing with the car? After that's answered we cam between the heads and the answer to the first question.