high performance parts for my rebuild

I have a 78 El Camino with a 75 Pontiac firebird motor i check with the vin number and i guess its a 350 5.7 liter rated at 175hp. i figured since im rebuilding the motor i might as well up grade the cam and lifters, intake manifol, and some long tube headers but i dont know which one to start with. i plan on using all edelbrock parts for the rebuild and they offer some nice cam and lifter kits with springs. is that a step in the right direction or should i go another route. My vision is to have a daily driver with access to some decent horse power when i want it. and the occasional trip to the local speed way. im not much of a gear head and have just a slight idea on what i am doing. i just have never rebuilt a motor which is why im doing this project. any info whould really help.  

Just want to be sure it is a true pontiac engine what is the casting numbers on the block and heads.  
professional hi-performance engine builder

Horsepower sells engines and torque wins races

im not shure what the number is yet i will know by the end of the day tommorow but im pretty shure it is a true pontiac cuz i bought the firebird from the original owner and took the engine out of the car and droped it in the el camino. but just for my info where on the block and heads should i look for the numbers.  

The casting numbers on the heads are located on the center exhaust ports and the casting code for the block is located right below the passenger side head on the front of the block.  
professional hi-performance engine builder

Horsepower sells engines and torque wins races