Your local auto supply store should be able to get one for you.
If not, try Googling , "Walker exhaust systems".

Hanky,

Dumb question which is the largest vavle on the 58 Buick Special Exhaust or Intake?

Big D

Hanky,

Thanks and yes all of the plugs were really carboned up.. I have the idle screws about 2 to 2/12 turns out. I will check the choke. We did rebuild the carb and it seems to be okay? When we move the cam to fast idle on the carb it seems to run pretty good. When it heats up and drops off the fast idle cam then the car eventually goes to a lower and lower idle until the engine dies. I did replace the old vacuum hoses that I could find and also replaced the ones on the wipers since it uses vacuum.

Thanks,

Big D,
No such thing as a dumb question, that's how we all learn !
The intake valve heads are larger than the exhaust valves.

mairraa,
the symptoms you describe all point to the engine flooding with excess fuel.
That 2 1/2 turns is only a starting point and they need to be adjusted to each individual engine. Did you do the adjustment procedure for the idle mixture screws I had mentioned earlier?