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I'm waiting to hear some feed back too.
I have a 75 hi boy with a 460. Headman headers don't work unless you notch out the cross members. I don't want to do that.
I put a REAL LONG informative thread a while back in here about the trials and tribulations of exhaust manifold/header swaps, in hopes of saving someone alot of headache.
Search eng might find it, if so enjoy, if not I can email directly to you.
I did a TECH post on a header install on a 76 highboy. I bought flowtech headers but it might help you and give you ideas. Type in TECH HEADER INSTALL 390 or look at the threads i started. LOTS OF PICS!
I have Hookers on my truck right now, I have a 400, so no specific tech info for you, but my set was a well built, very solid, nicely bent and nicely sealing product. Also you gotta want that back window sticker that says I (heart) my HOOKER haha.
i've run hooker super comp headers on my 74 f 250/460 for years and no problems,but you need to use a certain type of frame perch for their headers to work on the highboys with 429/460,the right side comes apart,but no quality issues or leaks,still have mine sitting in garage as i switched to fenderwells with my new motor,but they were kinda spendy