How do you make align the crank shaft gear and the cam shaft gear on a Chevrolet 350?

On most 350's, put both sprockets on then turn them so that the dot on the crank sprocket is straight up and the dot on the cam sprocket is straight down. Remove the cam sprocket, put the chain around it and slip the chain around the crank sprocket while placing the cam sprocket back into position, being careful to maintain the orientation. There were a few years around the late 70's where both dots are straight up. You would know right away when you adjust the valves because you would be assuming #1 was up for compression, and one of the rockers would be down to push the exhaust valve open. Rotate the crankshaft one revolution and readjust the valves.