What kind of Camshaft should I get?

So my timing belt on my 2V 351C is about to blow out and I figure that this is a sign from the muscle car god to tell me to sack up and buy that new cam already. Problem is, I dont know much about them... As an exhaust, I am going to run headman headers connected to cherry bomb glasspacks that have a pipe that exits right before the tires on each side. I'm not sure if thats important but some of the cams on Summit say "best for use with a full length exhaust". So what kind of cam should I buy. I dont want to spend over $150 bucks on it (I know I'm cheap but no one is willing to hire an 18 year old kid right now). What cam do you think I should get and why?

So I minor update, I left out the fact that O have a 4BBL Holley 600cfm carb, and an edelbrock performer manifold. I would eventually like to upgrade all of that stuff...torque converter, rear end, ect. This is just one step in that process. Usually as soon as the money comes in it goes right back out for parts. Now I've got a set of headers lying around cause I can't afford to have the pipes made up for me, and I need to install this cam...If only money grew on trees....