Help me please tryin to beef up 318

Hey please feel free to say anything you'd like I'm new to this type of stuff okay so this is what I've got going I've got a 1973 dart swinger with a 318 in it the motor was rebuilt 3-5 years ago I want to beef it up so I've bought a Holley 650cfm 4bbl carb an eldelbrock performance intake and a set of 1973-1974 360 heads and I'm in the process of buying new headers and a cam so my question is what do I need to do to the heads? I've heard they need to be milled but how much what other work needs to be done before I do that please leave me any information you have this car is my little hot rod my great grandpa gave me before he passed and I'm a senior in high school now and I want all the motor work finished by prom this in April 2016

Geez,the kid has something to work with, he gets arguments.. Holley carb & the Performer intake is workable,big time. Are you doing a full assemble,or just a top end( carb ,heads, intake ,& cam combo)? Unless you have a free head porter/machinist on campus,use stock 318 heads..Headers,obviously.. Depending on you budget ,& wrenching skills: If new to the game, a Summit racing cam lifter set:K6901 kit, (basically a 340 cam set,it works really well,on a budget. Not high lift,I really recommend new stock 340 springs,if possible..) You wanna beat someone with a mild 5.0,on a budget? Work the chassis! Post a few threads about that,that's where your real low buck wins come from.. It involves shock valving, tire clearance, pinion angle, & a limited slip would be nice, not necessarily. ( Do your research, ask questions here, & ask interactivley.. Lots of E.T in chassis ,on a Mopar, lots of money to be spent on a Fox body setup to be quick. Been there...You wanna win, you need to do research, & get dirty.. Ask for help,you might be surprised.