Headers vs 340 manifolds

When I got my '72 Dodge truck with a 360 the exhaust manifolds were badly cracked. I put headers on instead of manifolds after seeing the Richard Holdener Dodge 360 video, fortunately since my truck is pretty high off the ground cheaper headers fit well and don't drag (went with uncoated Hedman 1 5/8" long tubes). The mid-range torque gains were pretty substantial even with the stock 2-bbl cam as you can see in the video. One point to add, they don't just help at WOT either; I got noticeably better part-throttle torque and throttle response. As far as the typical downsides, I've had these headers on for a year and a half and they've never leaked with Percy's/Taylor Cable soft aluminum gaskets and spark plug access is arguably better than with the stock log manifolds. I drive the truck in all seasons and weather too btw.