318 mopar stock

I have read numerous post about how to add horsepower to a stock 318. I have a stock 1972 318 Mopar with 60,000 on it. I also have a Edlebrock performer (3776) intake manifold and a (1406) 600 cmf performer carburetor. I am on a very strict budget but would like to add a cam to give me more power. E