Thank you Steven!  Using the links you provided I was able to fix most, but
not all, of my problems.  Now that I understand the situation better I have
identified 3 issues, two of which I have resolved (documented below for
reference) and one that has not been resolved which I still need your help
with.

#1 - Port in test page
-------------------------------
I was able to fix this issue by copying the DefaultWsdlHelpGenerator.aspx
file from the current framework config sub directory to my website and adding
1 line of code to remove the port from the test page when it was posted to
our live server.  I left it alone if the location was localhost so that I
could still develop using custom port numbers.  Here is the line of code I
added:

 if (!httpAddress.Location.StartsWith("http://localhost"))
   {httpAddress.Location = httpAddress.Location.Replace("8000",
"80").ToString();}

I also had to add the following to the web config file in order to use the
custom test page:

 <webServices>
   <wsdlHelpGenerator href="DefaultWsdlHelpGenerator.aspx"/>
 </webServices>

#2 - Port in the WSDL for Soap
---------------------------------------------
I was able to fix this by adding a custom class to the App_Code directory:

Imports System
Imports System.Web.Services.Description

Public Class CustomSoapExtensionReflector
   Inherits SoapExtensionReflector

   Public Overloads Overrides Sub ReflectMethod()
       'no-op
   End Sub

   Public Overloads Overrides Sub ReflectDescription()
       Dim description As ServiceDescription =
ReflectionContext.ServiceDescription
       For Each service As Service In description.Services
           For Each port As Port In service.Ports
               For Each extension As ServiceDescriptionFormatExtension In
port.Extensions
                   Dim binding As SoapAddressBinding = TryCast(extension,
SoapAddressBinding)
                   If binding IsNot Nothing Then
                       If Not
binding.Location.StartsWith("http://localhost") Then
                           binding.Location =
binding.Location.Replace(":8000", "")
                       End If
                   End If
               Next
           Next
       Next
   End Sub
End Class

And also modifying the web.config to point to the new class:

 <webServices>
   <soapExtensionReflectorTypes>
     <add type="CustomSoapExtensionReflector, App_Code"/>
   </soapExtensionReflectorTypes>
 </webServices>

#2 - Port in the WSDL for Http
--------------------------------------------
This issue has NOT been resolved.  Although the solution to issue #2 solved
the first two items in the WSDL (see Soap & Soap12 below) it did not solve
the third item, HttpPost (see the port 8000 still in the WSDL file below).  I
still need help figuring out how to change that one along with the others.

<wsdl:service name="MyWebServices">
 <wsdl:port name="MyWebServicesSoap" binding="tns:MyWebServicesSoap">
   <soap:address location="http://www.mydomain.com/MyWebServices.asmx" />
 </wsdl:port>
 <wsdl:port name="MyWebServicesSoap12" binding="tns:MyWebServicesSoap12">
   <soap12:address location="http://www.mydomain.com/MyWebServices.asmx" />
 </wsdl:port>
 <wsdl:port name="MyWebServicesHttpPost" binding="tns:MyWebServicesHttpPost">
   <http:address location="http://www.mydomain.com:8000/MyWebServices.asmx"
/>
 </wsdl:port>
</wsdl:service>

Thanks in advance for any additional help!