well, you'd have to cut off the existing header flange and fab a new one for yourself, at a minimum. which is not all that difficult, you take a piece of flat stock and drill holes for the exhaust bolts and ports and you're good.
first criteria is that the header has to have the correct valve order, which in the case of a Buick big block or 350 is ( the big tell is the center exhaust runners are siamesed ):
IE, IE, EI, EI
this is why Rover headers
EI, EI, IE, IE
and Chevy big block headers
EI, EI, EI, EI
can't be adapted. the tubes aren't close to being in the right place. of course, you also need something that's pretty close bore spacing wise ( 4.750" for a BBB, 4.240" for a SBB 350 ) so you aren't jacking up the primaries trying to bend them all over the place.
something like the Chrysler 440 has a 4.800" bore spacing so that's a pretty close starting point.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
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H.H. Goddard, Human Efficiency (1920)
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