Sounds like you could be in the winners circle there.For your poppet valve I'll through this up here for you.
[Linked Image]
The black poppet valve of which you mentioned were usually fitted to a G4 carby and they had a flat surface where it seating the carby. The white LM version had a ridge that run round there with two openings in the ridge.You can see it in the image above.
As far as medication goes I'm always taking more than I should,but hey it keeps me smiling.

Here for a good time,not a long time.