Thank you Pete.
I am not looking for increased performance but just to make it run smoother. The Solex carb had been butchered by previous owner(s) who had badly warped the flange by overtightening the flange bolts causing a 2mm curve. I refaced it but there is loss of power at revs and I think the carb is past its sell by date, although I have put in new jets etc.
Regards, Bob