Nailhead question

I have a stock 401 cast intake manifold. There is a exhast plug located on the bottom side that is rusted out and needs to be replaced. Can anyone tell me who might sell these?
Thanks

 

the NailHeadBuick group on yahoo can answer any Nailhead question, Im not sure I know what you mean do you have a photo? is is a normal tapered plug?

 

It looks like a freeze plug hole. I'll see if I can post a picture later.

 

There is a Nailhead social group here on the HAMB lots of good info there.
Google Centerville Auto Repair and it should bring up Russ Martins shop. Nailhead guru
who also sells the right parts to use on your Nailhead.
These engines use some very Buick only specific parts.

 

It's just a common dish style soft plug...measure the diameter and any decent parts store could supply. Frank