318 horsepower

Okay so after doing a lot of thinking, reading, and talking to my wife, I have decided what it is that I am going to do. Since she has never raced before I am going to leave the bottom end of the motor as is for now. Put some sorta cam in it new timing gears and chain, new lifters, and push rods. have some head work done on my 302s, 360 valves and port/polished, and new springs and seats. put the edlebrock performer back on it with a holly 780. I will get a 2500 stall and put all back together and let her run it that way for a year. then build it to the 12 second class. that way she gets it out there sooner and gets a little seat time before going 12's.
I will still put the car on a major diet and tub it and all of that good stuff. Any suggestions on what cam to go with? should I use geat timing set or stay with a chain?