2 bolts, 1 opposite the other. There are 5 pics in the thread this link will take you to, look at the 4th pic:

https://www.gmforum.com/t277853/

Thanks for the help.

Okay so I tried to gain access to the thermostat housing again late last night to no avail. I looked at the link as you mentioned but it doesn't show how to remove the other parts that are on top of the thermostat housing. As far as I can see, part of the intake has to come off as well? I am getting really frustrated because it seems like a simple job yet there are many more parts to remove in order to get at the thermostat housing.

We will get someone with a 90'ish Bonneville to look at this, but you shouldn't have to remove anything to get the thermostat housing off.

Thanks 2KG4U.
I don't even see the second bolt, there is a lot of intake parts on top of the thermostat housing.

Sit tight for a minute. I just sent a PM to Danthurs, and if he is available he will chime in pretty soon with some advice.

You don't need to remove any other parts to get the housing off. There are two bolts, one at about 2 oclock, the other at about 7 oclock. You will need a socket and extension to get them off. Possibly a swivel. Once those two are off, there'* nothing holding it on other then a stuck gasket, so you may need to pry it a little.

I see the bolt at the 7 o'clock position but not the one at the 2 o'clock position. It must be under all those intake parts I was trying to remove last night. So what you guys are saying is that if I look directly over the intake parts at the 2 o'clock position, I should be able to see the second bolt?

I will try it again tonight.
Thanks again, you've been a great help!

Yes, it could be covered in grim if your engine is dirty.