Header upgrade

Decades ago when the first generation 360 crate motor came out, foggy memory says that "High Performance Mopar" magazine did a test on the crate motor starting with manifolds then 1 5/8, 1 3/4, and 17/8 headers. The engine picked up power everywhere in the curve at each dyno pull, topping out at 390 hp using the 1 7/8 headers, again this is foggy memory.......so my suggestion would be to put the 1 7/8 TTi's on and let it rip