Small block headers: worst to best fitting. List your experience.

Newbomb Turk said
The OP needs to define “fit”.

If you have a one piece header it’s probably not a good header.

Best fitting headers:

Hooker 5303 (can’t buy them any more but it’s still the best all around production head header there is.

Hooker 5204 (can’t get these any more either) but this is the best header for 340-360 inch almost stock engines.

Anything else is just a pain in the ***. Do they go on easy? Nope. But when they are on they fit and they work.

Not a TTi fan.
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Avatar car has the 5204 Hookers. 1-3/4" tube and spark plug access is direct and very simple for all of them. As mentioned, they can challenge you to get them on but once on, they fit well. Car is street-driven some but not a daily driver so ground clearance has not been an issue.