There are several types of headers available.First thing ya gotta do is to do the measuring,then go to a good speed shop,and see what headers they have in stock. On a 1937 Chevy car that I streetrodded,with a 350.I used the S_10 conversion headers which worked out quite well.They exit to the rear. Then on my 55 pickup with a 350 I used a nice set of blockhugger headers which exit straight down.Anytime you put a later model engine in one of these older vehicles,you are gonna have clearance problems,but with the headers available today there is always an easy solution.