So your looking at freshening the short block and adding some bolt-on's? I guess first thing you need to determine is what is the casting numbers on the heads (located under the valve covers), and whether it has dished or flat top pistons. The biggest majority of stock post '70 350's came with dished pistons. This will affect the cam choice because most of these 350's only have an actual compression in the 8.0 to 8.5-1 range. What year is the engine and what is it out of?
Assuming you have an 8.5-1 motor, this will be a good starting point...an engine that is very driveable, gets decent economy, and sounds pretty nice. Comp cams HE268 cam and lifters, cheap Z-28 style springs, edelbrock performer (or similar) intake, 600 holley or edelbrock carb, cheap recurve kit in the stock distributor, 1 5/8" full length headers, and at least a 2 1/4" exhaust system with mufflers of your choice. If the engine is in good shape and doesn't need new pistons, this would be a good place to start.
"This is not a cheerocracy...I make the cheercisions around here"