cold starting and ruff shut-off

["Arts Council" <artscape@clas.net>]

My '71B does not care for the cold weather it takes sometimes upto ten
minutes of grinding the starter (which scares the crap out of me, in
regards to my starter).  Once it starts it takes about fifteen minutes to
warm-up and then drives great.  Occasionally on shut-off (half the time),
the car tries to continue running.  Any suggestions? Carbs?

Thanks in advance,
Daniel North
'71 MGB, BRG