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Just about any for a SB Corvette will work fine on your ZZ4, don't let that "raised exhaust port" scare you, they aren't but about .30" higher and don't cause any problems with Hooker's, Dynomax or your old cast iron Ramshorn exhaust manifolds.
I just got the Sanderson shorty's. They have the correct "D" port, and is about all I can use with putting the original side pips back on with out some very wicked s bends!!
I know this is an old thread but I'm looking for some ZZ4 header alternatives that I can use for a dual exhaust set up on my '79. ... I'm just surprised at how much the Hooker ones are...$695??
Yeah, I did have them coated, but I wanted to make sure they fit first, 'cause on another brand of headers I purchased (that were already coated), I had to dimple a tube at the steering box, and it chipped the ceramic. The Hedmans didn't need dimpling, however I changed to NON-power steering. (On the set I dimpled, I still had power steering). On this Hedman part number, they don't have an option for ceramic coating from Hedman anyway.
Also check around as I found a place with a much better price on that same part number than the link I posted. I can dig up the vendor if you decide to get the Hedman's.