High Idle

["Nicholas J. Levett" <njlevett@cbdcom.apgea.army.mil>]

The 1980 MGB I'm thinking of buying has a high (3500 rpm) idle when
cold.  I noticed two screws missing from the choke housing.
Questions:
        a.  am I right in assuming this is causing the high idle?  It
            slows to ~2000 when warm.
        b.  where can you get replacements? (the Roadster Factory does
            not stock).

Thanks for the help.