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Clifford Performance is an old company that makes 6 cylinder performance upgrades and has a custom made header for the 170, 200, 250 inlines for the early Bronco. The header is a great fit (it doesn't require a different starter or other mods) and very well made, but it isn't cheap. They are the only header manufacturer for the 6 in a Bronco that I know of.
I got one of these about a year ago & bolted it on the 250 block I'm putting in my 66 to make sure it fit. I didn't have the starter bolted on(probably should have) so I don't know for sure if a stock starter will work. I only took this 1 pic before I pulled it & put it on the shelf for later when I can do the engine swap. I've got a mini starter on my 351 in another Bronco & may do this on the 250 anyway so it's not an issue for me. I realize this doesn't answer your question but thought I would share anyway - at about $120 you could get one & try it - If it doesn't fit you modify it or return it.
I got one of these about a year ago & bolted it on the 250 block I'm putting in my 66 to make sure it fit. I didn't have the starter bolted on(probably should have) so I don't know for sure if a stock starter will work. I only took this 1 pic before I pulled it & put it on the shelf for later when I can do the engine swap. I've got a mini starter on my 351 in another Bronco & may do this on the 250 anyway so it's not an issue for me. I realize this doesn't answer your question but thought I would share anyway - at about $120 you could get one & try it - If it doesn't fit you modify it or return it.
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I tried a header that looked much like that but the rear cylinder collectors dumped on the frame or half on the frame. I thought I could modify it for clearance but it didn't work out. Yours may be a different one. I think the one I tried was a stainless one made for a Mustang.
on flee-bay "Speed Dady" last summer looked like pic4 - shorties w/a convenient ball flange (able to angel out the 1st pipes). Matt @ vintage inlines sells a similar - a place that caters to the 6 ThriftPower ford i6 motors (C below link). I like the ;long tube' for tq ina bronk but headman stopped production. I think aussi-speed in Oz may have made long tube too, and still may.
Vintage Inlines exhaust systems bolt directly to this header. Made from T304 stainless steel, the three piece design not only makes installation and removal much easier, the lower extension pipes can be modified for custom applications. Kit includes black oxide header studs.***Now available...
www.vintageinlines.com
nice set, fantastic price. Matt wrks full time elsewhere so will take some time in sourcing. (Owner/builder) patients isa virtue.