After cutting off my single exhaust system from my
56 special 46r to convert it to dual exhaust, I've
found out the hard way that I need a different exhaust
manifold for the drivers's side. It has to be off a
dual exhaust 56 buick, special, century, super, roadmaster,
specific to just 1956 model year . I believe the part
number is: 1175581. I don't know if this matches the casting
number or not. Anyone that has this manifold and would sell
it to me, please let me know .
Thanks all for your help.

Tom Vellozzi