I agree with Bill. Rams horns are tried and true. Headers are more trouble than they are worth. Most have cheap coatings that don't hold up, they generally leak everywhere after a short time, cause starters to overheat, and don't add that much for performance on a stock engine. Just my opinion.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine