Like has been said and shown, they are sometimes on the inside face...you have to remove them to see, unless you can slip a mirror in there to read them....
Challengers (E-Body) have the same engine bay as B-Body. Torsion bars, etc are in different locations in A body than B/E bodies. Not sure the A headers will fit, but I could be wrong!
Grant...thats got to be a typo.....they can't be the same....Chally engine bay (same as B-body) is way wider than A-body.
They must be specing A-Body headers for use in B/E body cars.
Mike...exhaust shop here in my city wanted $900 for a stock-size, dual system w/Turbo's...not bloody likely. I ordered a system from Kepich...1 small problem with the headpipes, easily cured , and only $249 shipped.
I'm not sure they'll fit...your engine bay is narrower than '67 up. I think you need the specific '66-down "Early-A" LA manifolds...especially drivers' side...
2863553 = '68-71 340 A body
2863543= Don't have that one...do have 2863549 ..could it be that? If so, that ones '68-71 340 A body as well, so they are gennie's.
Ok , then...I guess you're waiting (patiently?)...be prepared to pay a good buck...340 mani's, in good shape, ain't cheap...especially the '68/'69 versions.
Good luck!
I'd leave it. If you free it up, it's eventually starts to rattle...ask me how I know.
Rebuild kits are expensive...
http://www.ebay.com/sch/i.html?_nkw=Dodge++heat+riser+kit&_sacat=0&_odkw=Mopar+heat+riser+kit&_osacat=0&_from=R40